SQL Server 2012分页获取数据的同时获取到总记录数（优化）

ALTER PROCEDURE dbo.tpGetPageRecords
(
    @OffSetRowNo INT,     
    @FetchRowNo INT,
    @TotalCount INT OUT
) 
AS 

SELECT CSTNO, CSTABBR 
FROM DBATABC
WHERE CSTABBR LIKE 'A%'
ORDER BY CSTNO
OFFSET ( @OffSetRowNo-1 ) * @FetchRowNo ROWS
FETCH NEXT @FetchRowNo ROWS ONLY

SET @TotalCount = 
(SELECT COUNT(*)
FROM DBATABC
WHERE CSTABBR LIKE 'A%')


GO

方案一：使用count(1) over()获取总记录数量

SELECT CSTNO, CSTABBR,COUNT(1) OVER () as TotalCount
FROM DBATABC
WHERE CSTABBR LIKE 'A%'
ORDER BY CSTNO
OFFSET ( @OffSetRowNo-1 ) * @FetchRowNo ROWS
FETCH NEXT @FetchRowNo ROWS ONLY

方式二：使用With AS

WITH Data_CTE 
AS
(
    SELECT [name], object_id
    FROM sys.all_objects
    --WHERE [name] LIKE 'fn_%'
), 
Count_CTE 
AS 
(
    SELECT COUNT(*) AS TotalRows FROM Data_CTE
)
SELECT *
FROM Data_CTE
CROSS JOIN Count_CTE
ORDER BY [name]
OFFSET (@PageNum - 1) * @PageSize ROWS
FETCH NEXT @PageSize ROWS ONLY;

参考地址：

https://stackoverflow.com/questions/18119463/better-way-for-getting-total-count-along-with-paging-in-sql-server-2012

SQL Server 2012以下版本：使用ROW_Number()

SELECT * FROM ( SELECT ROW_NUMBER() OVER(ORDER BY Id DESC) rn, COUNT(1) OVER() AS TotalCount, Id FROM dbo.T_User )a WHERE a.rn BETWEEN 1 AND 5