使用Row_Number（）选择行的子集

Question

Select id, name, ROW_NUMBER() OVER (ORDER BY id asc) as 'RowNo'
from customers
where RowNo between 50 AND 60

I am trying to select a subset of rows between 50 and 60 . The problem is 'RowNo' is an invalid column name.

Thank you

Using SQL SERVER 2008 R2

Answer 1

Use your query as subquery like bellow:

select * from (
    Select id, name, ROW_NUMBER() OVER (ORDER BY id asc) as [RowNo]
    from customers
) t
where RowNo between 50 AND 60

You can use CTE as well but whether to choose one over another read Difference between CTE and SubQuery? and check execution plan.

Answer 2

You need to do something like this:

;WITH PaginatingData AS
(
    Select id, name, ROW_NUMBER() OVER (ORDER BY id asc) as 'RowNo'
    from customers
)
SELECT *
FROM PaginatingData
where RowNo between 50 AND 60

Use a CTE (Common Table Expression - sort of an "inline view") as a "wrapper" so that your RowNo becomes a valid column name.

As an outlook - with SQL Server 2012, you'd be able to write something like this:

SELECT 
    id, name
FROM 
    dbo.customers
ORDER BY
    id
OFFSET 50 ROWS
FETCH NEXT 10 ROWS ONLY

SQL Server 2012 will have this ANSI SQL Standard compliant notation to do paging directly based on an ORDER BY clause. See this blog post (or tons of others) for more info and more samples.