1. rownum 分頁
select * from emp;
2. 顯示rownum[oracle分配的]
select e.*, rownum rn from (select * from emp) e;rn相當於oracle分配的行的id號
3.挑選出6—10條記錄
先查出1-10條記錄
select e.*, rownum rn from (select * from emp) e where rownum <= 10;
如果後面加上rownum>=6是不行的，
4. 然後查出6-10條記錄
select * from (select e.*, rownum rn from (select * from emp) e where rownum <= 10) where rn >= 6;
5. 幾個查詢變化
a. 指定查詢列，只需要修改最裡層的子查詢
只查詢雇員的編號和工資
select * from (select e.*, rownum rn from (select ename, sal from emp)
e where rownum <= 10) where rn >= 6;
b. 排序查詢，只需要修改最裡層的子查詢
工資排序後查詢6-10條資料
select * from (select e.*, rownum rn from (select ename, sal from emp order
by sal) e where rownum <= 10) where rn >= 6;
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