MYSQL group by 用于单独的 id

Question

这是结构和查询：http://www.sqlfiddle.com/#!9/de7ec8/4

结果如下：

+-------------+--------+
| id_requests | status |
+-------------+--------+
|           1 |      0 |
|           1 |      0 |
|           1 |      1 |
|           2 |      1 |
+-------------+--------+
4 rows in set

我正在寻找这个结果：

+-------------+--------+
| id_requests | status |
+-------------+--------+
|           1 |      0 |
|           1 |      1 |
|           2 |      1 |
+-------------+--------+
3 rows in set

我想按状态分组，但对于每个 id_requests，我们将不胜感激。

Answer 1

您似乎正在为此使用 distinct 子句选择不同的行

SELECT distinct a.id_requests, b.status 
FROM `admin_availability_requests` a