SQL Server 中的三种分页方式

USE tempdb
GO
SET NOCOUNT ON

--创建表结构
IF OBJECT_ID(N‘ClassB‘, N‘U‘) IS NOT NULL
    DROP TABLE ClassB
GO
CREATE TABLE ClassB(ID INT PRIMARY KEY, Name VARCHAR(16), CreateDate DATETIME, AID INT, Status INT)
CREATE INDEX IDX_CreateDate ON ClassB(CreateDate)
CREATE INDEX IDX_AID ON ClassB(AID)
GO

--插入测试数据
DECLARE @ID INT
SET @ID = 1
WHILE @ID <= 100000
BEGIN
    INSERT INTO ClassB VALUES(@ID, ‘fx‘, GETDATE(), @ID % 20, @ID % 20)
    SET @ID = @ID + 1
END

--统计总行数
SELECT ‘ClassB‘ AS ClassB, count(1) AS Count FROM ClassB

DECLARE @page_size INT = 20;
DECLARE @page_index INT = 3;
--A: 双Top：取出之前页的所有ID后，使用NOT IN排除这些ID进行查询，性能最差
WITH ID_List_Excluded AS
(
    SELECT TOP (@page_size * (@page_index - 1)) ID FROM ClassB WHERE CreateDate BETWEEN ‘2014-07-13‘ AND ‘2014-07-14‘ 
    ORDER BY CreateDate DESC, ID DESC
)
SELECT TOP (@page_size) * FROM ClassB WHERE ID NOT IN (SELECT ID FROM ID_List_Excluded) AND CreateDate BETWEEN ‘2014-07-13‘ AND ‘2014-07-14‘ 
ORDER BY CreateDate DESC, ID DESC;

DECLARE @page_size INT = 20;
DECLARE @page_index INT = 3;
--B: ROW_NUMBER：取出截至到当前页所有符合查询谓词的记录，并给每条记录加上序号，然后根据序号查询，性能次之
WITH NewClassB AS
(
    SELECT TOP (@page_size * @page_index) ROW_NUMBER() OVER (ORDER BY CreateDate DESC, ID DESC) AS ROWID, * FROM ClassB 
    WHERE CreateDate BETWEEN ‘2014-07-13‘ AND ‘2014-07-14‘
)
SELECT TOP (@page_size) * FROM NewClassB 
WHERE ROWID BETWEEN (@page_size * (@page_index - 1) + 1) AND (@page_size * @page_index);

DECLARE @page_size INT = 20;
DECLARE @page_index INT = 3;
WITH ID_List AS
(
    SELECT TOP (@page_size * @page_index) ID FROM ClassB 
    WHERE CreateDate BETWEEN ‘2014-07-13‘ AND ‘2014-07-14‘ 
    ORDER BY CreateDate DESC, ID DESC
)
,ID_List_Current AS
(
    SELECT ID FROM ID_List WHERE ID NOT IN(SELECT TOP (@page_size * (@page_index - 1)) ID FROM ID_List)
)
SELECT * FROM ClassB WHERE ID IN (SELECT ID FROM ID_List_Current);