Question

我想在下面做一个选择，结果是NULL。

查询在

下面

SELECT id, result
FROM  `fq_account_extend_result` 
WHERE id_extend =5
AND (
id =1
OR id =2
OR id =3
OR id =4
)
ORDER BY id ASC

结果如下：

id  result
1   testtest
2   asdasd
3   bill

我想包含id_extend = 4，即使结果是空的

id  result
1   testtest
2   asdasd
3   bill
4

Answer 1

SELECT id_extend, result

FROM fq_account_extend_result WHERE id = 5 AND id_extend IN（1,2,3,4） ORDER BY id ASC

Answer 2

试试这个：

   SELECT id_extend, result
    FROM  fq_account_extend_result
    WHERE id =5 AND
    id_extend IN(1,2,3,4)
    OR result is null
    ORDER BY id ASC

选择在结果中包含NULL或空

2 个答案: