Question

我有两个单独的查询：

SELECT COUNT(*)employees FROM company
WHERE status = 'A' AND salary_rate IS NOT NULL;

SELECT COUNT(*)employees FROM company
WHERE status = 'A' AND current_level IS NOT NULL;

我想在一个查询中显示这两个查询的结果。这可能吗？

Answer 1

我认为这就是你要找的东西： How to get multiple counts with one SQL query?

考虑到这一点，你想要这样的东西：

SELECT COUNT(*) AS totalcount, 
   SUM(CASE WHEN salary_rate IS NOT NULL THEN 1 ELSE 0 END) AS cnt1,
   SUM(CASE WHEN current_level IS NOT NULL THEN 1 ELSE 0 END) AS cnt2
FROM company
WHERE status = 'A';

输出将是status ='A'的所有记录的计数，然后计算两个不同的'not null'条件（如cnt1和cnt2）。

过滤同一数据库中的多个列

1 个答案: