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How To Use ROW NUMBER() In A WHERE Clause
From Wiki
If you try to use the ROW_NUMBER() windowing function in a WHERE clause you will get an error. Run the code below to see what I mean
- USE AdventureWorks
- GO
- SELECT
- ROW_NUMBER() OVER (ORDER BY addressline1) AS rowNum,
- addressline1,
- city
- FROM person.address
- WHERE rowNum > 3;
That gave the following error Server: Msg 207, Level 16, State 1, Line 6 Invalid column name 'rowNum'.
What you have to do is use Common Table Expressions or use a subquery. Below are both methods.
--Subquery
- SELECT * FROM ( SELECT
- ROW_NUMBER() OVER (ORDER BY addressline1) AS rowNum,
- addressline1,
- city
- FROM person.address) AS x
- WHERE rowNum > 3;
--CTE
- WITH x (rowNum,addressline1,
- city) AS
- (SELECT
- ROW_NUMBER() OVER (ORDER BY addressline1) AS rowNum,
- addressline1,
- city
- FROM person.address)
- SELECT * FROM X
- WHERE rowNum > 3;
Contributed by: --SQLDenis 02:34, 31 May 2008 (GMT)
Part of SQL Server Programming Hacks
Section Sorting, Limiting
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