MySQL select 查询对同一列的多个条件进行 AND 运算

Question

我有下面的测试表，表中包含以下行。

table: test_set(id (pk), pid int, fc int, fl int)

pid      fc    fl
1        7     30
1        8     31
1        9     35
2        7     39
2        8     40

现在如果我运行

SELECT pid FROM test_set WHERE fl=30 OR fl=35 GROUP BY pid;
#Result :
pid
---
1

正如预期，但如果我想运行

SELECT pid FROM test_set WHERE fl=30 AND fl=35 GROUP BY pid;
#Result :
result set (0) # Nothing matched!

这也符合预期，但我想超越预期。我的逻辑是 fl=30 和 fl=35 都有 pid=1 的共同点，即当它们相交时，它们会产生 pid=1

因此，具体来说，我需要 fl 列的多个值的结果，这些值具有一个或多个共同的pid。

我已经读过这篇文章 this并在那里发表了评论。

Answer 1

关于:

SELECT pid, COUNT(DISTINCT fl) AS count, GROUP_CONCAT(DISTINCT fl) list
FROM test_set
GROUP BY pid HAVING count > 1;

？

输出:

+------+-----------+------------------+
| pid  | count     | list             |
+------+-----------+------------------+
|    1 |         3 | 30,31,35         |
|    2 |         2 | 39,40            |
+------+-----------+------------------+

给定两个 fl 值:

SELECT pid, COUNT(DISTINCT fl) AS count
FROM test_set
WHERE fl IN (30, 35)
GROUP BY pid HAVING count = 2;

输出:

+------+-------+
| pid  | count |
+------+-------+
|    1 |     2 |
+------+-------+

给定三个 fl 值:

SELECT pid, COUNT(DISTINCT fl) AS count
FROM test_set
WHERE fl IN (30, 31, 35)
GROUP BY pid HAVING count = 3;

输出:

+------+-------+
| pid  | count |
+------+-------+
|    1 |     3 |
+------+-------+

最好在 pid 和 fl 上建立索引。