Question

我有以下查询：

SELECT num1
    -> from table4
    -> WHERE suffix IN ('mt', 'dn')
    -> GROUP BY num1
    -> HAVING COUNT(DISTINCT suffix) = 2;

这告诉我以下内容：

1563866656871111 
1563866656876839 
1563866656878888 
1563867854324841

我怎么只能得到数字4？

谢谢您的帮助：）

Answer 1

您可以只包装现有查询：

SELECT COUNT(*)
FROM (
    SELECT num1
    FROM table4
    WHERE suffix IN ('mt', 'dn')
    GROUP BY num1
    HAVING COUNT(DISTINCT suffix) = 2
) x

注意：给定您的示例数据，它将返回3，而不是4。

Answer 2

修改问题后，您似乎需要以下内容

SELECT num1
FROM table4
WHERE suffix IN ('mt', 'dn')
GROUP BY num1
HAVING COUNT(DISTINCT suffix)!<>2

Answer 3

如果您要计算行数，则可以使用它。

SELECT COUNT(x.num1)
    FROM (
        SELECT num1
        FROM table4
        WHERE suffix IN ('mt', 'dn')
        GROUP BY num1
        HAVING COUNT(DISTINCT suffix) = 2
    ) x

计数发生总数

3 个答案: