Answer simple quiz at the end of the blog post and -
Every day one winner from India will get Joes 2 Pros Volume 2.
Every day one winner from United States will get Joes 2 Pros Volume 2.
Many to Many relationships
If anyone has done some shopping on the internet you are familiar with the term “Shopping Cart” or “Shopping basket”. After you have selected a product you want to buy the storefront will gladly let you keep on shopping until there are many items in you shopping cart. On my last trip to Amazon.com I put 3 things in my cart before checking out. One item was a HDMI cable box converter for my flat screen TV at home. I took a closer look at this products rating and reviews before buying. Below this product it said this items was in the top 100 selling items in home electronics. This means this items has sold to more people than just me and I was not the first to buy this product.
Based on the story above what is the relationship to a product (like the HDMI cable box) and a customer who may want to buy that item? As a customer I can buy many products at once in my shopping cart. Does this mean there is a one to many relationship between customers (like me) and products (like the HDMI cable box). Yes there is but that is only a half truth. A product like the HDMI cable box can be purchased by many different customers. Therefore there is a Many to Many relationship between Customers and products. This product can be bought by many customers and many customer can buy this product.
Another many to many relationship is between books and Authors. I have written 5 books so we know there is at least a one to many relationship between Authors and Books. Now look at my 4th book (SQL Programming Joes 2 Pros Volume 4 – ISBN-13: 978-1451579482). This book has two authors (Rick A. Morelan and Pinal Dave). Since an Author can write many books and a book can be written by many authors there is a many to many relationship between authors and books.
We need a new process to map this complex relationship. Sometimes tables exist for the sole purpose of allowing indirect relationships between tables. What do you call tables the handle relationships for other tables? Common terms for these type of tables are mapping tables, bridge tables, or junction tables.
Many to Many relationships with invoicing systems
As discussed earlier a product can appear on many invoices and an invoice can have many products. The relationship between products and invoices is known as a many-to-many relationship as seen in the figure below.
If you were to ask yourself “What Products are on Invoice 5631?” or “Go-Duck was ordered on how many invoices?” you could resolve this query? The Figure below shows us how to resolve both mappings. We can see the Go-Duck toy was order twice (on 7/15 and on 9/22). We can also see the shopping cart 5631 has two items in it (Toy Car and Furchee).
Now we’ll take a look at many-to-many relationships between sales invoices and products in the JProCo sample database.
Here is an example of JProCo’s sales invoices mapping to a bridge table (SalesInvoiceDetail) in order to map over to the CurrentProducts table. The CurrentProducts table gives us all the detail of the current products that have been ordered.
With SalesInvoice 5 It looks like many products were ordered on that one invoice (Products 9, 11, 12, and 16). To see what those products are, we would look over to the CurrentProducts table. We see Product 9 is an Underwater Tour 3 Days East Coast. Product 11 is an Underwater Tour 1 Week East Coast, and so forth. So a SalesInvoice can have many products, and products can be ordered on multiple sales invoices.
The SalesInvoiceDetail table is the mapping table that is handling the many to many relationship between the SalesInvoice table and the CurrentProducts table. This 3 table join between these tables would look like the query you see below.
SELECT si.CustomerID, si.InvoiceID, si.OrderDate,
sd.Quantity, cp.ProductName, cp.RetailPrice
FROM dbo.SalesInvoiceDetail AS sd
INNER JOIN dbo.SalesInvoice AS si
ON sd.InvoiceID = si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
Note: If you want to setup the sample JProCo database on your system you can watch this video. For this post you will want to run the SQLQueriesChapter3.0Setup.sql script from Volume 2.
Question 8
Q.8) You have tables named dbo.SalesInvoice and dbo.SalesInvoiceDetail. CustomerID is located in the SalesInvoice table and InvoiceID is located in both tables. You have been told to show the discount amounts from the SalesInvoiceDetail table that correspond to the sales of a specific CustomerID of 490. Which T-SQL statement should you use?
- SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490 - SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490 - SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
WHERE EXISTS (dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490)
Please post your answer in comment section to win Joes 2 Pros books.
Rules:
Please leave your answer in comment section below with correct option, explanation and your country of resident.
Every day one winner will be announced from United States.
Every day one winner will be announced from India.
A valid answer must contain country of residence of answerer.
Please check my facebook page for winners name and correct answer.
Winner from United States will get Joes 2 Pros Volume 2.
Winner from India will get Joes 2 Pros Volume 2.
The contest is open till next blog post shows up at http://blog.sqlauthority.com which is next day GTM+2.5.
Reference: Pinal Dave (http://blog.SQLAuthority.com)
Answer No. 1 is the right one. It’s a little bit tricky question because CustomerID is located in the SalesInvoice table (alias si), but you can see that all the answers go for SalesInvoiceDetail table (alias sd) to get CustomerID field, so CustomerID field might be located in SalesInvoiceDetail table too…
Rene Castro
El Salvador
Correct answer is option 1:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
because option 1 has relation between SalesInvoice and SalesInvoiceDetail
also between CurrentProducts and SalesInvoiceDetail tables
Second option does n’t have relation between SalesInvoice and SalesInvoiceDetail
Third option is not a valid query
Thanks.
Country – India
option1 is the query we will use.
Good posts, short and to the point
option1 is the query we will use.
bcz salesinvoice and invoicedetails have a relation based on invoiceid.
and we tie these 2 tables with the invoiceid
Good posts, short and to the point.
Boston USA
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
I think this T-SQL statement will give expected result.
India
-Dnyanesh
Option 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Option 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Leo Pius
USA
Option 1 is right answer.
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Neelesh
India
Answer:1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Kulwant kumar
Delhi India
the answer is
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
country :India [Ahmedabad]
Correct Answer is # 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Gopalakrishnan Arthanarisamy
Bangalore, India
[...] Q 8) SQL SERVER – Tips from the SQL Joes 2 Pros Development Series – Many to Many Relationships – D… [...]
Option 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
will give a correct result.
Correct Answer is option 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
From,
Malay Shah
City:Ahmedabad
Country: India
Correct Answer: Query #1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country of residence: India
Answer: Query #1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country: India
The correct answer is option 1 that is
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Here we know that SalesInvoiceDetail and SalesInvoice table has “InvoiceID” column collon in both tables so that we can inner join on that. Also we know that we have “ProductID” column in both CurrentProducts and SalesInvoiceDetail table so that we can make Inner Join on that. Also we only details of CustomerID= 490
, so that we have to put this into “Where” clause.
I am from
INDIA
AHMEDABAD
Hi Pinal,
I believe that the alias for one of the tables is not correct, but if I would go for it it would be
1. SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Location US – Minneapolis.
Hi,
Q.8) You have tables named dbo.SalesInvoice and dbo.SalesInvoiceDetail. CustomerID is located in the SalesInvoice table and InvoiceID is located in both tables. You have been told to show the discount amounts from the SalesInvoiceDetail table that correspond to the sales of a specific CustomerID of 490. Which T-SQL statement should you use?
Ans 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
I am from India
The Correct Answer is Option 1:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
India.
Correct answer is option 1:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Pratik Raval
India
Option 1. is the Answer
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
(Sale, Nigeria)
Option 1 is correct answer.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Varinder Sandhu (India)
option 1 should do the trick, so answer should be:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Ritesh Shah (India)
answer is option 1:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks
Riyas.V.K
Option 1 is the answer:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
INDIA
Brijesh
Option 1
Option 1
VMSSanthosh(Bangalore, India)
option 1 should do the trick, so answer should be:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
- Rahul Sharma Noida India
Choice 1 is the Answer
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country: India
In my opinion all the 3 options are incorrect, as it says “sd.CustomerID” which means it is to be fetched from SalesInvoiceDetail however SD does not contain CustomerID. CustomerID belongs to SalesInvoice table.
If its a spelling mistake, then its altogether a different scenario.
Krunal K. Doshi
INDIA
I second you on that
I wonder why the others haven’t noticed this
Correct answer is option 1:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Cheers,
Prasad Yangamuni
INDIA (Pune)
1 is the right answer
Abhishek Bhat
India
Correct Option is 1
i.e, SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
I’m from INDIA
Option 1 is the correct Answer
Country: India
Option 1 is correct
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks
Vivek Srivastava
Missed the country. Reposting the comment, please ignore previous one.
Option 1 is correct
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks
Vivek Srivastava
Country INDIA
correct answer is : 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Question 8
Q.8) You have tables named dbo.SalesInvoice and dbo.SalesInvoiceDetail. CustomerID is located in the SalesInvoice table and InvoiceID is located in both tables. You have been told to show the discount amounts from the SalesInvoiceDetail table that correspond to the sales of a specific CustomerID of 490. Which T-SQL statement should you use?
Answer is 1.
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Option 1 is the correct one.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
country: India
Thanks
GurjitSingh
Question 8
Q.8) You have tables named dbo.SalesInvoice and dbo.SalesInvoiceDetail. CustomerID is located in the SalesInvoice table and InvoiceID is located in both tables. You have been told to show the discount amounts from the SalesInvoiceDetail table that correspond to the sales of a specific CustomerID of 490. Which T-SQL statement should you use?
correct answer is 1:
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Correct Answer: 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
India
Option 1 is the correct answer.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country -India
Option No. 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Somnath Desai
India
Answer is no:1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks & Regards
Karthikeyan.T
INDIA
The correct answer is option 1:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Jankhana,
India.
The Correct Answer is Option-1
Thanks,
Narendra(India)
Ans:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Partha
India
option 1 happens to be the correct one..
Option 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Annie
Bangalore
-India
Answer
Option 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country:India
Hi Pinal,
Table alians are not correct in any option.
Correct answer should be
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Hi Pinal,
Table alians are not correct in any option.
Correct answer should be
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
I am from India
option (1) is correct answer
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
from india
Hi Pinal,
I simply say 3 options are wrong. First option query almost correct but it’s column alias interchanged. I have corrected query following..
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail As sd
INNER JOIN dbo.SalesInvoice As si ON sd.InvoiceID = si.InvoiceID
INNER JOIN CurrentProducts As cp ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Answer is : SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
SalesInvoice has InvoiceID
SalesInvoiceDetail has InvoiceID
and both are connected
but CurrentProducts has ProductID which connect with SalesInvoiceDetail.ProductID
Country : India
The correct answer is option 1.
New Delhi
Hi Pinal,
I simply say 3 options are wrong. First option query almost correct but it’s column alias interchanged. I have corrected query following..
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail As sd
INNER JOIN dbo.SalesInvoice As si ON sd.InvoiceID = si.InvoiceID
INNER JOIN CurrentProducts As cp ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country : India
Option 1 is the answer.
Bhavesh Darji
India
Correct Option is 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
karan
India
Answer : option 1
Country:India
Correct option is option 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
as SalesInvoiceDetail makes an inner join with SalesInvoice on InvoiceID and further for every invoice we have productid, so SalesInvoiceDetail makes an inner join with CurrentProducts for CustomerID=490
Sumit
India
Correct Answer : 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Shekhar Gurav.
Country – INDIA
The correct answer is #1
USA
Mike Michalicek
Correct Option: 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
By this query, system will identify invoices For customer: “WHERE si.CustomerID= 490″ and then Find out Invoice details by “dbo.SalesInvoiceDetail sd INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID”
Country: INDIA
Tejas
Correct option is number 1:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
INDIA
Answer: Option 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country: India(sikha)
None of them acutally run on the sample database. I assume there is just a typo in #1 and that the answer should be (note I changed the alias/column names to match your screen shot to get this to work for CustomerID and sd.DiscountAmt)
1)SELECT si.CustomerID, sd.UnitDiscount, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
I’m picking 1 assuming typos because #2 references columns that do not exist in either table and #3 exists clause is incorrectly written
from the USA
Option 1 is the Correct answer
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
It has relation between SalesInvoice and SalesInvoiceDetail and also between CurrentProducts and SalesInvoiceDetail tables
Yasodha.N(India)
Hi Pinal,
I think given queries are wrong because SalesInvoiceDetail Table Not Having CustomerID column. please check it.
Hi Pinal,
I think given queries are wrong because SalesInvoiceDetail Table not having CustomerID column. please check it.
Otherwise if alias interchanged then option 1 is correct.
Pune,India.
Answer 1 is correct
INDIA
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Texas, USA
Here is the answer:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Texas, USA
None of the answers are correct, however the “most” correct option is 1:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Explanation: To filter on customerID we need to join on salesinvoice si. The question tells us to get the discount amounts from the salesinvoicedetail sd, but the discount amount being retreived in option 1′s select statement comes from salesinvoice si. The question also tells us that the customerID field is in the salesinvoice table si. We’re filtering on the correct customerID field, but I think the table aliases were transposed in the SELECT portion of the statement and shoudl be si.CustomerID and sd.DiscountAmt.
These could just be a typos. Other than that, the joins are correct so that we could get the information we need.
Option2 doesn’t join against salesinvoice which contains the customer ID
Option3 is not a valid statement
Country of Residence: USA
Option 1 is correct answer.
Bangalore, India
Option 1 is Right
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Yeou Sunn
India
Option 1 is correct in logic but need to fix typo: CustomerID is in si and DiscountAmt is in sd:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
USA
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Chetan – USA
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
kkmjssate
india
Hi Pinal,
Challenge:
Q.8) You have tables named dbo.SalesInvoice and dbo.SalesInvoiceDetail. CustomerID is located in the SalesInvoice table and InvoiceID is located in both tables. You have been told to show the discount amounts from the SalesInvoiceDetail table that correspond to the sales of a specific CustomerID of 490. Which T-SQL statement should you use?
Correct Answer:
The first choice is the correct answer:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Explanation:
The first query is correct. The second query doesn’t even reference the SalesInvoice table, so that query is discarded. The third query uses a WHERE EXISTS incorrectly and won’t compile.
Country:
United States
Thanks for the knowledge!
Regards,
Bill Pepping
This is a very interesting and tricky question, as none of the answers is correct. I spent about 5 or more minutes looking at these 3 queries before coming to this conclusion.
Answer #3 can be eliminated right away as the syntax is wrong.
Answer #2 can be eliminated also as it doesn’t reference SalesInvoice table at all
Finally, answer #1 is almost correct, but it references sd.CustomerID, which is wrong as CustomerID belongs to SalesInvoice table. Therefore none of the answers is correct.
So, my answer will be:
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp — if we need to show Product Names we join with CurrentProducts table
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
It’s the same as #1 with the corrected typo.
I am from USA
I think the alias is wrong in the first option’s query but if I have to go with given options then I assume that “CustomerID” is also present in dbo.SalesInvoiceDetail table.
So, the correct answer is option (1).
Thank You.
Country – India.
Hi,
the Answer is 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
We can inner join the tables to get the required fields and filter it by the alias name of table.
SivaSakthiVel
- INDIA
“Save Our tigers”
#1 is the correct answer–SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Rahul Thapa–India
Option 1 will return an invalid column
Option 2 does not join to a table that contains the CustomerId
Option 3 is not valid.
Option 1 is the closest in that it has the correct joins, but needs to have the select statement edited as follows:
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks for the fun question. I’m from the USA.
Mike
Hi Sir,
As per the question you have said that “CustomerID is located in the SalesInvoice table”
but in all the queries the select statement is like
“SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd”
so as per this all the queries will fail.
If that was a mistake done while typing then answer 1 is the correct option.
i.e “SELECT si.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490″
Anish Shenoy
INDIA,Bangalore,Karnataka
Hi Sir
I’ll use option number one to run this t-sql
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Leonardo Guerrero
from Chile
answer:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
lalit
india
Answer is option 1
Sandeep
INDIA
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Gordon Kane
Allen TX
USA
Answer 1 is correct:
“SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490″
Rajneesh Verma
(INDIA)
Answer
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thank You
Ramdas
Hello,
Find my answer below :
2nd and 3rd option is wrong. if we consider 1st option then it will give an error message like “Invalid column name si.DiscountAmt” .
If we rectify the 1st option query by modifying si.DiscountAmt to sd.DiscountAmt. then it will give you error free output.
Hope you understand…
I am from India..
OPTION 1 IS THE CORRECT ANSWER
RAHUL SINGH RATHORE
INDIA
Correct Answer for the above question is Option : 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
DILIP KUMAR JENA
Country : INDIA
As you said : “CustomerID is located in the SalesInvoice table and InvoiceID is located in both tables. You have been told to show the discount amounts from the SalesInvoiceDetail table that correspond to the sales of a specific CustomerID of 490. Which T-SQL statement should you use? ”
So Query should be :
SELECT si.CustomerID, sd.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Correct answer is :
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Country: United States
The (most) correct option is 1:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Option2 -> doesn’t join against salesinvoice which contains the customer ID
Option3 -> is not a valid statement
Country of Residence: USA
Option 1
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
USA
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Divesh
INDIA
Correct Answer is Option : 1.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Bablu
Country : – INDIA
Answer 1 is the correct one
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
correct answer, is option 1 modified,
SELECT si.CustomerID,sd.UnitDiscount,cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
C. Lennick, Country: USA
Correct answer is option 1:
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Shilpa
India
Option 1
1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks
Shree
Question 8
Right answer Opt : #1
1- SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Chennai ,INDIA
Correct Answer is :option 1
Country USA
Option 1 is the right Answer,I.e.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Because Here we want Discount from SalesInvoiceDetail Table and For Customer No 490. CustomerNo exist in SalesInvoice Table and Discount is available in SalesInvoiceDetail Table and their must be a relation between SalesInvoice and SalesInvoiceDetail Table to get the exact value and that we are performing in above given query.
Alok Chandra Shahi
India
Option 1 is correct. Because, it considers both SalesInvoice table holding CustomerID. Other tables dont have CustomerID column. Option 2 and Option 3 queries will fail, as they dont have the Select clauses aliases in the FROM Clause. So, the correct answer is Option 1, which will successfully get the results.
1) 1.SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Venkataraman R,
USA.
La respuesta la opcion 1 es la correcta
thanks!
Q 8) SQL SERVER – Tips from the SQL Joes 2 Pros Development Series – Many to Many Relationships – Day 8 of 35
A.) The code in (2) does not look at the SalesInvoice Table which contains the CustomerID field so it will return an error. The use of EXISTS with a subquery in the WHERE clause will either return every row in the SalesInvoiceDetail table or none of them, regardless of the CustomerID, so (3) is also incorrect. Because ‘dbo. SalesInvoiceDetail sd INNER JOIN dbo.SalesInvoice si ON sd.InvoiceID = si.InvoiceID’ will return only records that have a match from both tables and ‘WHERE si.CustomerID = 490’ will filter the results to only display records having a CustomerID of 490, (a) is the ALMOST correct answer.
However, the SELECT of the query references sd.CustomerID, which is wrong as CustomerID belongs to SalesInvoice table.
This one was indeed Tricky one to test how many really reads the whole blog post :)
Winner from USA: David Seefeld
Winner from India: sandipak
I thank you all for participating here. The permanent record of this update is posted on facebook page.
Both the winners are from USA
Both Winners are from USA…..
Option 1 is the right Answer,I.e.
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Because Here we want Discount from SalesInvoiceDetail Table and For Customer No 490. CustomerNo exist in SalesInvoice Table and Discount is available in SalesInvoiceDetail Table and their must be a relation between SalesInvoice and SalesInvoiceDetail Table to get the exact value and that we are performing in above given query.
Aditi
India
Option 1 is the correct query
Uday
USA
Answer is #1:
SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490
Thanks,
Wayne
Option 1 Is the only query that would compile, but the correct answer is none of the above. Either:
SELECT DiscountAmt
FROM dbo.SalesInvoice
WHERE CustomerID= 490
OR
SELECT SUM(DiscountAmt) [Total Discount]
FROM dbo.SalesInvoice
WHERE CustomerID= 490
Depending on whether the question was a list of the individual discounts the customer got with each order or if they wanted the total discount. The problem with the first one is that it gives detailed information with no context. (When did the customer make each order, etc.) The second might benifit from more context as well:
SELECT SUM(DiscountAmt) [Total Discount], COUNT(InvoiceID) [Total Orders]…
Interesting, I made the assumption that DiscountAmt was an aggregate amount stored in the invoice table. It isn’t in your table diagram. (Made sense, discount amount could be affected quantity ordered, etc. and I don’t mind some denormalization…)
Making some more assumptions about what is wanted and using just diagrammed table schemas, I come up with:
SELECT cp.ProductName, COUNT(DISTINCT si.InvoiceID) [Total Orders]
, SUM(sd.Quantity*sd.UnitDiscount) [Total Discount]
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID AND si.CustomerID=490
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
GROUP BY cp.ProductName
If you want, throw in “si.CustomerID, ” (NOT sd. – I take it back, NO option given would compile with the given schema) to both the SELECT and GROUP, but I’d only do it if more than one customer would be listed. (Would be an interesting schema if the customer was in sd, because that means a single invoice could be set up for multiple customers.) I put in DISTINCT because a unique index on “invoice, product” ids wasn’t declared in the detail table. (Logical schema setup and then distinct is only needed if you want a one line result for all products)
Sorry, I wasn’t consise, didn’t read all the way down to see if these errors were spotted or not.
Hmmm, I didn’t put in ISNULL function or IS NOT NULL, because I ASSUMED the fields couldn’t be NULL.
[...] Q 8) SQL SERVER – Tips from the SQL Joes 2 Pros Development Series – Many to Many Relationships – D… [...]
Answer : Option 1
From (USA)
Answer : Option 1
[...] SQL Joes 2 Pros Development Series – Many to Many Relationships [...]
1. SELECT sd.CustomerID, si.DiscountAmt, cp.ProductName
FROM dbo.SalesInvoiceDetail sd
INNER JOIN dbo.SalesInvoice si
ON sd.InvoiceID= si.InvoiceID
INNER JOIN CurrentProducts AS cp
ON cp.ProductID = sd.ProductID
WHERE si.CustomerID= 490