用于分页显示的SQL文

原址 http://technet.microsoft.com/ja-jp/library/cc411406.aspx

看了一篇SQL2005关于Transact-SQL的强化技能的介绍，觉得很有用处，简单总结了一下。

（一）数据库做成
USE tempdb – 或者新建一个DB
CREATE TABLE SpeakerStats
(
speaker VARCHAR(10) NOT NULL PRIMARY KEY,
track VARCHAR(10) NOT NULL,
score INT NOT NULL,
pctfilledevals INT NOT NULL,
numsessions INT NOT NULL
)

SET NOCOUNT ON
INSERT INTO SpeakerStats VALUES('Dan', 'Sys', 3, 22, 4)
INSERT INTO SpeakerStats VALUES('Ron', 'Dev', 9, 30, 3)
INSERT INTO SpeakerStats VALUES('Kathy', 'Sys', 8, 27, 2)
INSERT INTO SpeakerStats VALUES('Suzanne', 'DB', 9, 30, 3)
INSERT INTO SpeakerStats VALUES('Joe', 'Dev', 6, 20, 2)
INSERT INTO SpeakerStats VALUES('Robert', 'Dev', 6, 28, 2)
INSERT INTO SpeakerStats VALUES('Mike', 'DB', 8, 20, 3)
INSERT INTO SpeakerStats VALUES('Michele', 'Sys', 8, 31, 4)
INSERT INTO SpeakerStats VALUES('Jessica', 'Dev', 9, 19, 1)
INSERT INTO SpeakerStats VALUES('Brian', 'Sys', 7, 22, 3)
INSERT INTO SpeakerStats VALUES('Kevin', 'DB', 7, 25, 4)

（二）
SQL2005下的SQL语句（1）和2000下的（2）执行结果一致
（1）
SELECT ROW_NUMBER() OVER(ORDER BY score DESC, pctfilledevals DESC,
numsessions DESC, speaker) AS rownum,
speaker, track, score, pctfilledevals, numsessions
FROM SpeakerStats
ORDER BY score DESC, pctfilledevals DESC, numsessions DESC, speaker

（2）
SELECT
(SELECT COUNT(*)
FROM SpeakerStats AS S2
WHERE S2.score > S1.score
OR (S2.score = S1.score
AND S2.pctfilledevals > S1.pctfilledevals)
OR (S2.score = S1.score
AND S2.pctfilledevals = S1.pctfilledevals
AND S2.numsessions > S1.numsessions)
OR (S2.score = S1.score
AND S2.pctfilledevals = S1.pctfilledevals
AND S2.numsessions = S1.numsessions
AND S2.speaker < S1.speaker)) + 1 AS rownum,
speaker, track, score, pctfilledevals, numsessions
FROM SpeakerStats AS S1
ORDER BY score DESC, pctfilledevals DESC, numsessions DESC, speaker

（三）
只显示固定范围的行号
SELECT *
FROM (SELECT ROW_NUMBER() OVER(ORDER BY score DESC, speaker) AS rownum,
speaker, track, score
FROM SpeakerStats) AS D
WHERE rownum BETWEEN 4 AND 6
ORDER BY score DESC, speaker

rownum speaker track score
------ ---------- ---------- -----------
4 Kathy Sys 8
5 Michele Sys 8
6 Mike DB 8

（四）
@pagenum ：表示当前页数
@pagesize ：表示每一页最大显示行数
DECLARE @pagenum AS INT, @pagesize AS INT
SET @pagenum = 2
SET @pagesize = 3
SELECT *
FROM (SELECT ROW_NUMBER() OVER(ORDER BY score DESC, speaker) AS rownum,
speaker, track, score
FROM SpeakerStats) AS D
WHERE rownum BETWEEN (@pagenum-1)*@pagesize+1 AND @pagenum*@pagesize
ORDER BY score DESC, speaker

rownum speaker track score
------ ---------- ---------- -----------
4 Kathy Sys 8
5 Michele Sys 8
6 Mike DB 8
（结果共11行，每页三行，第二页共显示3条，即4-6）

（五）
每一行经过计算之后得到的行号存入TABLE，用该行号索引数据
SELECT ROW_NUMBER() OVER(ORDER BY score DESC, speaker) AS rownum, *
INTO #SpeakerStatsRN
FROM SpeakerStats
CREATE UNIQUE CLUSTERED INDEX idx_uc_rownum ON #SpeakerStatsRN(rownum)

可以用以下SQL文，简单执行一下，看看效果，^_^
DECLARE @pagenum AS INT, @pagesize AS INT
SET @pagenum = 2
SET @pagesize = 3

SELECT rownum, speaker, track, score
FROM #SpeakerStatsRN
WHERE rownum BETWEEN (@pagenum-1)*@pagesize+1 AND @pagenum*@pagesize
ORDER BY score DESC, speaker