Offset Fetch Next to get all rows

问题

I have a query in SQL Server 2012 that should get back a number of records based on the page size I specify and the page it is on. It looks like this:

SELECT LocID, LocName
FROM Locations
ORDER BY LocName OFFSET @PageNum ROWS
FETCH NEXT @PageSize ROWS ONLY

The code is pretty simple. What I need to do, though, is put that into a function to return the paging correctly. However, I could also be needing all records back from this function, so I need to have the option of calling the function without any OFFSET or FETCH (mostly, this is for a report that has no paging and should only be the straight data). I can't think of a good way to do this.

回答1:

You could say:

@PageNum  INT,
@PageSize INT

...

SELECT @PageSize = COALESCE(@PageSize, 2000000000);   
-- 2 billion should be enough?

... OFFSET (COALESCE(@PageNum, 1)-1)*@PageSize ROWS
FETCH NEXT @PageSize ROWS ONLY;

When you just want all rows, pass in NULL to both parameters.

来源：https://stackoverflow.com/questions/12375837/offset-fetch-next-to-get-all-rows