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Thursday, April 5, 2012

Ties, Rank, Row_number function

I have used ranked function to find and remove duplicate rows in my procedures but i have found another option that may be more feasible with my queries. Sql server introduce Ties function that return one value from a column that has duplicate values as we can see in following example

Declare @Table table(id int ,brand varchar(5),price money)

insert into @Table
values (1,'GE',20),(2,'GE',21),(3,'Sony',21)

;with dup
as
(
select rank() over(partition by brand order by price) as dup,* from @Table
)
select * from dup where dup=1


SELECT Top(1) With Ties * 
FROM @Table
WHERE price between 19 and 21 
Order By ROW_NUMBER() OVER (PARTITION By Brand ORDER BY price)


results for both queries are same but this is good use of Ties function in queries.


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