外连接SQL> select * from a1;BBB
----------
101
102
103
104
105SQL> select * from a2;BBB CCC
---------- --------------------
101
102
105SQL> select * from a1,a2 where a1.bbb(+)=a2.bbb;BBB BBB CCC
---------- ---------- --------------------
101 101
102 102
105 105SQL> select * from a1,a2 where a1.bbb=a2.bbb(+);BBB BBB CCC
---------- ---------- --------------------
101 101
102 102
103
104
105 105SQL>
----------
101
102
103
104
105SQL> select * from a2;BBB CCC
---------- --------------------
101
102
105SQL> select * from a1,a2 where a1.bbb(+)=a2.bbb;BBB BBB CCC
---------- ---------- --------------------
101 101
102 102
105 105SQL> select * from a1,a2 where a1.bbb=a2.bbb(+);BBB BBB CCC
---------- ---------- --------------------
101 101
102 102
103
104
105 105SQL>
如
select bc_checkbill.barcodeno ,clients.Aname from bc_checkbill,clients where bc_checkbill.cstid=clients.cstid(+)