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分页查询

MySQL分页,关键字limit

示例:

--select * from 表名 where 限制条件 limit num1(start),num2(size);

 

Oracle分页,关键字rownum

示例1:

select ename,rownum from emp;

select ename,rownum from (select * from emp);

示例2:(三层过滤,效率较高):

select t2.* from (select t1.*, rownum rn from (select * from emp)t1 where rownum<=6)t2 where rn>=4;

--第一层:

--select * from emp ..

--第二层:

--select * from (第一层) where rownum <=6(endNum);

--第三层:

--select * from (第二层) where rownum >=4(startNum);

示例3:按照入职时间的顺序,查询从第7个到第10个人

select t2.* from (select t1.*, rownum rn from (select * from emp order by hiredate)t1 where rownum<=10)t2 where rn>=7;

参考:http://www.linuxidc.com/Linux/2013-01/78288.htm

 

分页查询