Question

我必须删除一个已禁用用户的表。问题是，我必须在最后使用where子句。这是最重要的一点，因为否则我无法测试我的查询。

where子句很重要，因为如果没有子句，我将删除整个数据库，而不仅是禁用的用户。

DELETE a
   FROM CONTENT_PERM a
   JOIN user_mapping b
     ON a.USERNAME = b.USER_KEY
        (JOIN CWD_USER c
           ON b.USERNAME = c.USER_NAME)
  WHERE c.ACTIVE = 'F';

Answer 1

如果我理解正确，那么您不需要在()之间加入JOIN

DELETE a
FROM CONTENT_PERM a
JOIN user_mapping b
ON a.USERNAME = b.USER_KEY
JOIN CWD_USER c
ON b.USERNAME = c.USER_NAME
WHERE c.ACTIVE = 'F';

Answer 2

只需使用Select Query，只需删除Delete并检查您是否获得了正确的结果，然后根据结果可以采取措施删除查询。如下所示。

Select a
FROM CONTENT_PERM a
JOIN user_mapping b
ON a.USERNAME = b.USER_KEY
JOIN CWD_USER c
ON b.USERNAME = c.USER_NAME
WHERE c.ACTIVE = 'F';

Answer 3

您可以在下面尝试

DELETE FROM CONTENT_PERM
WHERE USERNAME IN (SELECT USER_KEY FROM user_mapping WHERE USERNAME IN (SELECT USER_NAME
from CWD_USER where ACTIVE = 'F'));

有2个联接的SQL删除吗？

3 个答案: