在Oracle 10g中使用左连接删除

我有以下代码在MS sql Server中工作正常：

delete grp
from grp
left join my_data
on grp.id1 = my_data.id1
and grp.id2 = my_data.id2
and grp.id3 = my_data.id3
and grp.id4 = my_data.id4
where my_data.id1 is NULL

基本上,我想删除在grp中可以找到的所有事件,并且在my_data中没有任何等价性.不幸的是,它在Oracle 10g中不起作用.我尝试使用旧的语法左连接(),但它也不工作.喜欢这个：

delete grp
from grp,my_data
where grp.id1 = my_data.id1 (+)
and grp.id2 = my_data.id2 (+)
and grp.id3 = my_data.id3 (+)
and grp.id4 = my_data.id4 (+)
and my_data.id1 is NULL

如果我没有多个密钥,但是我看不到如何使用我的数据,则IN子句将起作用.那么什么办法呢？

表格和数据：

sql> create table grp (id1 number null,id2 number null,id3 number null,id4 number null);    
Table created.

sql> create table my_data (id1 number null,id4 number null);

Table created.

sql> insert into grp values (1,2,3,4);

1 row created.

sql> insert into grp values (10,20,30,40);

1 row created.

sql> insert into grp values (1,40);

1 row created.

sql> insert into my_data values (1,4);

1 row created.

sql> commit;

Commit complete.

使用in.注意如果子查询中的ID可以为空,请勿使用.不在null不会返回true.

sql> delete grp where (id1,id2,id3,id4) not in (select id1,id4 from my_data);

2 rows deleted.

sql> select * from grp;

       ID1        ID2        ID3        ID4
---------- ---------- ---------- ----------
         1          2          3          4

使用存在

sql> rollback;

Rollback complete.

sql> delete grp where not exists (select * from my_data where grp.id1 = my_data.id1 and grp.id2 = my_data.id2 and grp.id3 = my_data.id3 and grp.id4 = my_data.id4);

2 rows deleted.

sql> select * from grp;

       ID1        ID2        ID3        ID4
---------- ---------- ---------- ----------
         1          2          3          4

sql>

原文地址：https://www.jb51.cc/oracle/205478.html