如何将MySQL查询结果限制在前3位

Question

我试图让这个数据库查询只返回3个最常见的状态，但不知怎的，我继续得到所有返回的状态，按降序排列。不知道我哪里错了......？

SELECT state, COUNT(*) as count
FROM Contact
GROUP BY state
HAVING state NOT IN(' ')
ORDER BY COUNT(*) DESC
LIMIT 3

Answer 1

我认为您没有正确使用HAVING。

我只想使用此查询

SELECT state, COUNT(1) AS state_count
FROM Contact
WHERE state <> ' '
GROUP BY state
ORDER BY state_count DESC
LIMIT 3

演示〜http://sqlfiddle.com/#!2/8fc57/1