Comments on: SQL SERVER – Query to Get Unique Distinct Data Based on Condition – Eliminate Duplicate Data from Resultset

By: srbhogayta

srbhogayta — Mon, 29 Apr 2013 07:31:12 +0000

hello, sir
I am using row_number 2 times in my sp so, it is right or not ? I want to display records as per distinct url and i have already used row_number for paging in my stored procedure. so, how can i display the records with unique url. please help asap….
thanks

By: Jagadeesh Bollabathini

Jagadeesh Bollabathini — Mon, 25 Feb 2013 05:23:03 +0000

It helped me.

Thank u so much……
you reduced my R & D work.

By: tim

tim — Tue, 14 Aug 2012 13:40:19 +0000

coolpal9 :

Again, being a MySQL guy, my first response was group_concat. So, I took that and searched for group_concat equivalent in MS SQL, and found this:

http://stackoverflow.com/questions/451415/simulating-group-concat-mysql-function-in-ms-sql-server-2005

Hope that link helps you do what you want to do. Looks to be what you are asking for.

(also, my post above is incorrect – it should be just SELECT * FROM ( … – without the ‘t’ after the from )

By: joshp84

joshp84 — Tue, 14 Aug 2012 00:00:18 +0000

…and so the question remains – which is fastest / best? :)

By: coolpal9

coolpal9 — Mon, 13 Aug 2012 07:42:31 +0000

thanks for updating me with this. Now suppose if I want to display the Product and Color, where all colors corresponding to the Product are dispalyed together separated with comma.

I am attempting to do something like this and I am not finding the prper solution. Pl help me with it…

By: tim

tim — Tue, 31 Jul 2012 19:12:49 +0000

In MySQL, this is very strait-forward:

select * from t
(select * from Table1 order by product, price DESC) as t
group by product

it will preserve the order of the sub-query, and take the first record when grouping. Seems like MSSQL is aways more complicated than necessary.

By: Chris Ross

Chris Ross — Tue, 31 Jul 2012 13:20:24 +0000

To return a de-duped value to an outer table

Select outer.column, inner.column
From dbo.outer
cross apply (
Select top 1 column
From table
Where outer.id = table.id
Order by sortcolumn
) inner

By: nagendra Srinivas Gubbal

nagendra Srinivas Gubbal — Tue, 31 Jul 2012 07:14:10 +0000

with NQ as
(SELECT Product,Price,Color ,ROW_NUMBER() Over(Partition by Product Order by Price desc ) as RowNum
FROM [TempProduct])

SELECT Product,Price,Color from NQ
where RowNum = 1

By: Michal Kaczmarski

Michal Kaczmarski — Tue, 31 Jul 2012 07:06:56 +0000

– Query Cost: 36%
;WITH CTE AS (
SELECT Product, MAX(Price) Price
FROM TABLE1
GROUP BY Product
)

SELECT CTE.Product, CTE.Price, Table1.Color
FROM CTE
JOIN Table1 ON CTE.Product = Table1.Product AND CTE.Price = Table1.Price

– Query Cost: 64%
SELECT Product, Price, Color
FROM
(SELECT Table1.*,
ROW_NUMBER() OVER (PARTITION BY Product ORDER BY Price DESC) AS RN
FROM Table1) AS t
WHERE RN = 1
ORDER BY ID

By: Selva

Selva — Mon, 30 Jul 2012 14:23:43 +0000

Dear Venkatesh,

We need color also… If our requirement is to fetch The Product and Maximum Price only mean Your Query is Enough . But our requirement is to fetch the color also, So only we need such type of Different Query .

According to the requirement the query may vary .

By: dselvag

dselvag — Mon, 30 Jul 2012 11:42:55 +0000

By: dselvag

dselvag — Mon, 30 Jul 2012 11:28:49 +0000

Nice

By: JO

JO — Sat, 28 Jul 2012 08:20:27 +0000

SELECT Product, Price, Color
FROM Table_test b
where exists(Select 1 from
(
Select product, MAX(price)price
from Table_test
group by product)a where a.Product = b.Product and a.price = b.Price)

By: Venkatesh(fresher )

Venkatesh(fresher ) — Sat, 28 Jul 2012 01:45:47 +0000

select Product,max(Price) from table1 group by Product

when i run this query it also returns the same result how can i know where to use and what the difference between ur query and this query ………………….

By: Rishab Arora

Rishab Arora — Fri, 27 Jul 2012 21:44:56 +0000

Select distinct B.product , B.Price, B.Color
from table_1 B
join
(Select product, max(price) max_price from table_1 group by product) A
on A.product = B.product and A.max_price = B.Price

By: Ed

Ed — Fri, 27 Jul 2012 14:23:15 +0000

SELECT p.Product, p.Price, p.Color
FROM Table1 p
INNER JOIN (
SELECT product, MAX(price) as Price
FROM Table1
GROUP by Product ) q on p.product = q.Product and p.price = q.Price
ORDER BY ID

This is the same as other posts, but may not always yield the same results as the original solution. If you add another row to the original table, you would up with duplicate products if the max price of a product is available in more than one color.

INSERT INTO Table1
SELECT 8, ‘Pencil’, 200, ‘Brown’

Results
Product Price Color
Toy 100 Black
Pen 100 Black
Pencil 200 Yellow
Cup 400 Brown
Pencil 200 Brown

The original solution returns the same 4 rows as it did before.

By: Nelson John

Nelson John — Fri, 27 Jul 2012 12:40:11 +0000

For Better performance and readability

with cte(RN,Product,Price,color)
as
(
SELECT
RN=row_number() over (PARTITION BY Product order by price desc ) ,
Product, Price, Color
FROM Table1
)
select * from cte where RN=1

In case we are into older version of sql and to make compatible with other RDBMS sysstems

select T.Product,T.Price,T.color
from
Table1 T inner join (select Product,max(Price) as Price from Table1 group by Product) VT
on t.Product=VT.Product and t.Price=VT.Price

Thanks
Nelson
[Web Addressed moved to URL field]

By: Purna Magum

Purna Magum — Fri, 27 Jul 2012 07:21:33 +0000

Excellent

By: Nash

Nash — Fri, 27 Jul 2012 06:18:10 +0000

WITH Test(Product,Price) AS
( SELECT Product,MAX(Price)
FROM Table1
GROUP BY Product
)SELECT A.*,B.Color FROM Test A JOIN Table1 B ON A.Product =B.Product AND A.Price =B.Price

By: pinaldave

pinaldave — Fri, 27 Jul 2012 05:48:44 +0000

Thanks and fixed.

By: Taher

Taher — Fri, 27 Jul 2012 05:43:45 +0000

Just a observation: Spelling mistake in the post title
Eleminate — It should be Eliminate :)

By: Harsh

Harsh — Fri, 27 Jul 2012 05:37:36 +0000

Minor Changes to Original Solution:

This will bring highest priced latest record.

SELECT Product, Price, Color
FROM
(SELECT Table1.*,
RANK() OVER (PARTITION BY Product ORDER BY Price DESC,ID DESC) AS RN
FROM Table1) AS t
WHERE RN = 1
ORDER BY ID

By: Harsh

Harsh — Fri, 27 Jul 2012 04:56:24 +0000

SELECT table2.Product, table2.price, MAX(Table1.Color) AS Color
FROM
(SELECT Product, MAX(Price) AS price
FROM Table1 AS t
GROUP BY Product) AS table2
INNER JOIN
Table1 ON Table1.Product = table2.Product AND Table1.Price = table2.price
GROUP BY table2.Product, table2.price

By: Harsh

Harsh — Fri, 27 Jul 2012 04:54:24 +0000

SELECT DISTINCT Product,
(SELECT TOP (1) Price FROM Table1
WHERE (t1.Product = Product) ORDER BY Price DESC) AS Price,
(SELECT TOP (1) Color FROM Table1
WHERE (t1.Product = Product) ORDER BY Price DESC) AS Color
FROM Table1 AS t1

By: Deepa

Deepa — Fri, 27 Jul 2012 04:31:07 +0000

SELECT B.Product, A.Price, b.color
FROM (SELECT Product, MAX(Price) AS price
FRom table1
group by Product) A JOIN TABLE1 B
ON A.Price = B.Price AND A.Product = B.Product
order by 1