Question

我需要通过acc_id和SUM（6 - total）选择tableA，count（id）组。

TableA
ID | acc_id | user_id
1  |  2     |   20
2  |  2     |   21
3  |  3     |   22
4  |  3     |   10

期待结果：

 total: 8

我试过了：

select 6-count(id) as total
from tableA 
group by acc_id 
having total < 6 AND total <> 0

我的输出：

total: 4, total: 4

我最后需要总结一下。我该怎么办？

Answer 1

SELECT SUM(total)
FROM (
    SELECT 6-count(id) AS total
    FROM tableA 
    GROUP BY acc_id
) sub
GROUP BY total
HAVING total < 6 AND total <> 0

Answer 2

我做到了，我从@Samuel O'Connor那里得到了代码并编辑了它：

 select sum(if(total = 0,6,total)) as total_sum
    from(
      select
          6-count(id) as total 
            from tableA 
            group by acc_id) sub
            where total < 6

感谢您的帮助。

Answer 3

你的目标不明确。

但在这里我试图获得你期望的8

http://sqlfiddle.com/#!9/a4b76/3

SELECT SUM(t.total)
FROM (
SELECT 6-COUNT(id) as total
FROM TableA
GROUP BY acc_id) t

sql select sum count变量

3 个答案: