表A:a b c d
1 1 2 3
1 1 3 4表B a b c f
1 1 2 5SELECT * from A aa, B bb where aa.a=bb.a and aa.b=bb.b
应该会得到 a b c d c f
1 1 2 3 2 5
1 1 3 4 2 5
我怎样才能得到表: a b c d c f
1 1 2 3 2 5
1 1 3 4
1 1 2 3
1 1 3 4表B a b c f
1 1 2 5SELECT * from A aa, B bb where aa.a=bb.a and aa.b=bb.b
应该会得到 a b c d c f
1 1 2 3 2 5
1 1 3 4 2 5
我怎样才能得到表: a b c d c f
1 1 2 3 2 5
1 1 3 4
SQL>
SQL> with A as (
2 select 1 a, 1 b, 2 c, 3 d from dual union all
3 select 1, 1, 3, 4 from dual
4 ),
5 B as
6 (
7 select 1 a, 1 b , 2 c, 5 f from dual
8 )
9 SELECT aa.*,bb.c,bb.f from A aa left join B bb on aa.a=bb.a and aa.b=bb.b and aa.c= bb.c
10 / A B C D C F
---------- ---------- ---------- ---------- ---------- ----------
1 1 2 3 2 5
1 1 3 4 SQL>
SELECT aa.*, bb.c, bb.f from A aa left join B bb on aa.a=bb.a and aa.b=bb.b and aa.c=bb.c