sql 分頁

2010-05-18 15:09 by 賀臣, 449 閱讀, 收藏, 編輯

1.分頁方案一：(利用Not In和SELECT TOP分頁)效率次之 
語句形式： 
SELECT TOP 10 * FROM TestTable 
WHERE(ID NOT IN (SELECT TOP 20  id FROM  TestTable  ORDERBY  id))   ORDERBYID 
SELECT  TOP 頁大小 * FROM TestTable     
WHERE( ID NOT IN　(SELECT  TOP  每頁大小-1*待查詢頁數-1  id  FROM  表　ORDERBY  id)) ORDERBYID 
思路:先查詢出待查詢頁以前的所有條數的id,查詢ID不在這些ID中的指定數量條數 

2.分頁方案二：(利用ID大於多少和SELECT TOP分頁)效率最高 
語句形式： 
SELECT  TOP  10 *   FROM  TestTable     
WHERE(ID> (SELECT MAX(id) FROM(SELECT TOP20 id  FROM  TestTable ORDERBYid)AST))ORDERBYID     
SELECT  TOP  頁大小* FROM  TestTable     
WHERE(ID>(SELECTMAX(id)FROM(SELECT TOP 每頁大小*待查詢頁數-1  id  FROM表  ORDERBYid)AST)) ORDERBYID 
思路:先得到待查詢頁的以前所有條數id,得到它們當中最大的ID號,以此最大ID號爲標誌,查找比這個ID號大的指定條數 

3.分頁方案三： 
SELECT TOP PageSize * FROM(SELECT TOP nPage*PageSize * from YOURTABLE order by id)as a order by id desc 
SELECT TOP 每頁條數 * FROM (SELECT TOP 待查詢頁*每頁條數) * from YOURTABLE order by id)as a order by id desc 
思路:先正排序查詢出待查詢頁以前(包括當前頁)的所有條數,而後將其倒排序,取指定條數 
4.分頁方案四： 
(利用SQL的遊標存儲過程分頁) 
create　procedureSqlPager 
@sqlstrnvarchar(4000),--查詢字符串 
@currentpageint,--第N頁 
@pagesizeint--每頁行數 
as 
setnocounton 
[email=[ft=,2,]declare@P1int,--P1]declare@P1int,--P1[/email]是遊標的id 
@rowcountint 
[email=execsp_cursoropen@P1output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcountoutput]execsp_cursoropen@P1output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcountoutput[/email] 
            selectceiling([email=[ft=,2,]1.0*@rowcount/@pagesize)as]1.0*@rowcount/@pagesize)as[/email]總頁數--,@rowcountas總行數,@currentpageas當前頁 
            [email=set@currentpage=(@currentpage-1)*@pagesize+1]set@currentpage=(@currentpage-1)*@pagesize+1[/email] 
            [email=[ft=,2,]execsp_cursorfetch@P1,16,@currentpage,@pagesize]execsp_cursorfetch@P1,16,@currentpage,@pagesize[/email] 
            [email=[ft=,2,]execsp_cursorclose@P1]execsp_cursorclose@P1[/email] 
            setnocountoff 
其它的方案：若是沒有主鍵，能夠用臨時表，也能夠用方案三作，可是效率會低。 
建議優化的時候，加上主鍵和索引，查詢效率會提升。 

1.Oracle:
  select * from ( select row_.*, rownum rownum_ from ( query_SQL ) row_ where rownum =< max) where rownum_ >= min
2.SQL Server:
  select top @pagesize * from tablename where id not in (select top @pagesize*(@page-1) id from tablename order by id) order by id
3.MySQL
  select * from tablename limit position, counter
4.DB2
  select * from (select *,rownumber() as ROW_NEXT from tablename) where ROW_NEXT between min and max