Question

请帮我构建选择SQL，我的标准是

用户

USER_ID删除
  111个1
  222个0
  333 1

tab1

USER_ID删除
  111个1
  222个0
  333 0

tab2

USER_ID删除
  111个1
  222个0
  333 1

tab3

USER_ID删除
  111个1
  222个1
  333 0

对我而言，情况是如果删除了用户表中的user_id（删除= 1），则应删除tab1，tab2和tab3中的所有引用记录（删除= 1）。

我需要找出用户表中删除（删除= 1）的user_ids，但是他们的记录在tab1，tab2或tab3表中都保持活动状态（已删除= 0）

例如： user_id：111被删除，其所有其他表中的数据也被删除。但是user_id：333已被删除，但其在tab1和tab3中的记录仍然有效。我需要找出这些user_id，比如333。

请帮我构建select sql

Answer 1

试试这个

   SELECT USER_ID FROM USER AS A
    WHERE DELETED = 1
    AND EXISTS (SELECT 1 FROM TAB1 AS B WHERE A.USER_ID = B.USER_ID AND B.DELETED = 0)
    OR  EXISTS (SELECT 1 FROM TAB2 AS B WHERE A.USER_ID = B.USER_ID AND B.DELETED = 0)
    OR  EXISTS (SELECT 1 FROM TAB3 AS B WHERE A.USER_ID = B.USER_ID AND B.DELETED = 0)

Answer 2

试试这个：

WITH x AS (SELECT 111 AS user_id , 1 AS deleted FROM dual UNION ALL 
                          SELECT 222 AS user_id, 0 AS deleted FROM dual UNION ALL
                         SELECT 333 AS user_id , 1 AS deleted FROM dual ),
         y as (SELECT 111 AS user_id , 1 AS deleted FROM dual UNION ALL 
                          SELECT 222 AS user_id, 0 AS deleted FROM dual UNION ALL
                         SELECT 333 AS user_id , 0 AS deleted FROM dual ),
         z as (SELECT 111 AS user_id , 1 AS deleted FROM dual UNION ALL 
                          SELECT 222 AS user_id, 0 AS deleted FROM dual UNION ALL
                         SELECT 333 AS user_id , 1 AS deleted FROM dual ),
         w as (SELECT 111 AS user_id , 1 AS deleted FROM dual UNION ALL 
                          SELECT 222 AS user_id, 1 AS deleted FROM dual UNION ALL
                         SELECT 333 AS user_id , 1 AS deleted FROM dual )

SELECT x.user_id FROM x, y, z, w 
WHERE x.user_id = y.user_id AND 
      x.user_id = z.user_id AND 
      x.user_id = w.user_id AND 
      x.deleted = 1 AND 
                  (x.deleted != y.deleted OR 
                   x.deleted != z.deleted OR
                   x.deleted != w.deleted);

OUTPUT将是：

   USER_ID
----------
    333

选择具有多个条件组合的sql

2 个答案: