Mysql Count(*) as Total，其中Total？

Question

SELECT
  Id, QId, UName, Ans, Date, COUNT(*) * 10 as Total
FROM
  question
WHERE
  COUNT(*)
DESC
GROUP BY
  UName

不起作用:(

Answer 1

我认为您想要筛选组。使用HAVING COUNT(*)而不是WHERE

SELECT Id, QId, UName, Ans, Date, Count(*) * 10 as Total
FROM question
GROUP BY UName
HAVING Count(*)

如果要按元素数量对组进行排序，请使用ORDER BY

SELECT Id, QId, UName, Ans, Date, Count(*) * 10 as Total
FROM question
GROUP BY UName
ORDER BY Count(*) DESC