一、多表查詢

select a1.ename,a2.dname,a1.sal from emp a1,dept a2 where a1.deptno=a2.deptno order by a1.deptno;
 

二、分頁查詢

rownum分頁
select * from emp;
顯示rownum【oracle分配的】
select a1.*,rownum rn from (select * from emp) al;
select a1.*,rownum rn from (select * from emp) a1 where rownum<=10;
select * from (select a1.*,rownum rn from (select * from emp) a1 where rownum<=10) where rownum>=6;

三、用查詢結果建立新表