我有两个表使用debt_id及其状态。如何获得无偿债务ID? 用不同的,存在的等尝试各种查询,但没有运气.. 也许有人有想法让我走上正轨:)
下表中的结果应为debt_id = 11(当债务未支付时)
+----+---------+---------------+
| PK | debt_id | debt_state_id |
+----+---------+---------------+
| 1 | 3 | 1 |
| 2 | 3 | 2 |
| 3 | 11 | 1 |
| 4 | 15 | 1 |
| 5 | 15 | 2 |
+----+---------+---------------+
+---------------+----------+
| debt_state_id | status |
+---------------+----------+
| 1 | not paid |
| 2 | paid |
+---------------+----------+
答案 0 :(得分:0)
您可以使用not exists
select t1.debt_id from table_name t1
where t1.debt_state_id = 1
and not exists (
select 1 from table_name t2
where t1.debt_id = t2.debt_id
and t2.debt_state_id = 2
)
此处table_name
是问题的第一个表格