Mysql

Question

我有table这样的

|  idrule  |  idsys  |
----------------------
|R01#1     |     1   |
|R01#1     |     2   |
|R01#2     |     1   |
|R01#2     |     3   |
|R01#2     |     4   |
|R01#3     |     2   |
|R01#3     |     1   |
|R01#3     |     5   |
|R01#4     |     1   |
|R01#4     |     4   |
|R01#4     |     3   |
----------------------

我想 select 在一个输入数组中使用 2 个条件，如果我想输入（idsys = 1 和 idsys = 2），那么输出应该是：

| idrule |
----------
|R01#1   |
|R01#3   |
----------

有没有人可以帮忙？谢谢

-----问题补充----- 这是解决方案：

SELECT idrule
FROM tablename
WHERE idsys IN (1, 2)
GROUP BY idrule
HAVING count(*) = 2

我想在"Where"条件下添加"MAX(somefield)"可以吗？所以代码将是：

SELECT idrule
FROM tablename
WHERE MAX(somefiled) and
idsys IN (1, 2)
GROUP BY idrule
HAVING count(*) = 2

但不工作？任何的想法？

Answer 1

SELECT idrule 
    FROM *table* t 
        JOIN *table* ct ON t.idrule = ct.idrule 
    WHERE t.idsys=1 AND ct.idsys=2;

Answer 2

你可以这样做：

SELECT idrule
FROM tablename
WHERE idsys IN (1, 2)
GROUP BY idrule
HAVING count(*) = 2

Mysql - select 条件和数组输入？

Mysql - select with condition and input in array?

base

rule