**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

- 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.**

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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****)**

## 127 comments. Leave new

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

Answer : Option 1

Answer : Option 1

From (USA)

Hmmm, I didn’t put in ISNULL function or IS NOT NULL, because I ASSUMED the fields couldn’t be NULL.

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.

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 correct query

Uday

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

Both Winners are from USA…..

Both the winners are from USA

Q 8) SQL SERVER – Tips from the SQL Joes 2 Pros Development Series – Many to Many Relationships – Day 8 of 35A.) 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 SeefeldWinner from India:

sandipakI thank you all for participating here. The permanent record of this update is posted on facebook page.

La respuesta la opcion 1 es la correcta

thanks!

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.

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

Correct Answer is :option 1

Country USA

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

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

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

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

Answer 1 is the correct one

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.

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

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

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

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

The (most) correct option is 1:

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

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

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 for the above question is Option : 1.

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

OPTION 1 IS THE CORRECT ANSWER

RAHUL SINGH RATHORE

INDIA

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..

Answer

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

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)

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 is option 1

Sandeep

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

lalit

india

Hi Sir

I’ll use option number one to run this t-sql

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

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

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

#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

Hi,

the Answer is 1.

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”

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.

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

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

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

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

Option 1 is correct in logic but need to fix typo: CustomerID is in si and DiscountAmt is in sd:

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

Option 1 is Right

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 answer.

Bangalore, India

None of the answers are correct, however the “most” correct option is 1:

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

Here is the answer:

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

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

Answer 1 is correct

INDIA

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.

Hi Pinal,

I think given queries are wrong because SalesInvoiceDetail Table Not Having CustomerID column. please check it.

Option 1 is the Correct answer

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)

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

Answer: Option 1

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)

Correct option is number 1:

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 Option: 1

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

The correct answer is #1

USA

Mike Michalicek

Correct Answer : 1

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

Correct option is option 1

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

Answer : option 1

Country:India

Correct Option is 1.

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

Option 1 is the answer.

Bhavesh Darji

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

Country : India

The correct answer is option 1.

New Delhi

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

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

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,

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

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

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

Option 1

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

option 1 happens to be the correct one..

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

The Correct Answer is Option-1

Thanks,

Narendra(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.

Answer is no:1

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

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

Option 1 is the correct answer.

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

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

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:

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.

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?

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 is : 1

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

Missed the country. Reposting the comment, please ignore previous one.

Option 1 is correct

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

Option 1 is correct

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

Option 1 is the correct Answer

Country: 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

1 is the right answer

Abhishek Bhat

India

Correct answer is option 1:

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)

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

Choice 1 is the Answer

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 1 should do the trick, so answer should be:

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

Option 1

VMSSanthosh(Bangalore, India)

Option 1

Option 1 is the answer:

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

answer is option 1:

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 should do the trick, so answer should be:

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)

Option 1 is correct answer.

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. 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)

Correct answer is option 1:

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

The Correct Answer is Option 1:

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.

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

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.

The correct answer is option 1 that is

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

Answer: Query #1

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

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

Correct Answer is option 1.

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

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 # 1.

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

the answer is

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]

Answer:1

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

Option 1 is right answer.

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

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.

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 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

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

option1 is the query we will use.

Good posts, short and to the point

Correct answer is option 1:

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

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