create table l as select 'left_1' as str,'1' as v from dual union allselect 'left_2' ,'2' as v from dual union allselect 'left_3' ,'3' as v from dual union allselect 'left_4' ,'4' as v from dual ;create table r as select 'right_3' as str,'3' as v, 1 as status from dual union allselect 'right_4' as str,'4' as v, 0 as status from dual union allselect 'right_5' as str,'5' as v, 0 as status from dual union allselect 'right_6' as str,'6' as v, 0 as status from dual ;select * from l; --where l.v not in (select r.v from r )select * from r--1. inner join 返回两表相匹配的数据 即 交集select l.str as left_str,r.str as right_str from l inner join r on l.v=r.vorder by 1,2;select l.str as left_str,r.str rigth_str from l,rwhere l.v=r.vorder by 1,2;--2.left join 左表为主表，左表返回全部数据，右表只返回与左表相匹配的数据select l.str as left_str,r.str right_str from l left join r on l.v=r.vorder by 1,2;select l.str as left_str,r.str as right_str from l,r where l.v=r.v(+)order by 1,2;select l.str as left_str,r.str as right_str from l,r where l.v=r.vorder by 1,2; --3.right join 右表为主表，左表只返回与右表相匹配的数据select l.str as left_str,r.str as right_str from l right join r on l.v=r.v order by 1,2;select l.str as left_str,r.str right_str from l,rwhere l.v(+)=r.v order by 1,2;--4. 左右表均返回全部的数据，但是只有相匹配的数据显示在一行，非匹配的数据只显示一个表的数据select l.str as left_str,r.str as right_str from l full join r on r.v=l.vorder by 1,2;
转载于:https://www.cnblogs.com/iyoume2008/p/6395648.html
