数据库的分页算法

最新推荐文章于 2019-06-26 09:29:36 发布

原创最新推荐文章于 2019-06-26 09:29:36 发布 · 1.5k 阅读

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#数据库 #mvc #service #算法 #n2

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本文介绍了SQLSERVER、ORACLE、DB2、MYSQL等不同数据库中实现分页查询的技术方法，包括使用特定的SQL语法、函数及操作来高效地获取指定范围的数据记录。

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各个数据库的分页算法

1.SQL SERVER 是用先逆序再正序的方法

select top 3 * from (select top 9 * from mvc_book order by bid) as s order by s.bid desc [第6,5,4条]

select * from (select top 3 * from (select top 6 * from mvc_book order by bid) as s order by s.bid desc) as s1 order by s1.bid [第4,5,6条]

select top 6 * from mvc_book where (bid not in (select top 2 bid from mvc_book))[第3,4,5,6,7,8条]

2.ORACLE 用Minus和Rownum来实现 (Minus 减去 Union 联合 Intersect 返回相同的记录集)

select * from t_service_vnet_send where rownum <= 15 MINUS select * from t_service_vnet_send where rownum <= 10;
或
select * from (select rownum no,id,age,name from loaddata where rownum <= 3 ) where no >= 2;

3.DB2
select * from (select ROW_NUMBER() over() as a, org.* from org) as temp where a>=n1 and a<=n2

4.MYSQL
select * from tablename limit m,n;