SQL选择总和计数变量

Question

I need to select tableA, count(id) group by acc_id and SUM(6 - total).

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

Expecty Result:

 total: 8

I tried:

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

My output:

total: 4, total: 4

I just need to sum it in the end. How can I do it?

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

I did it, I got code from @Samuel O'Connor and edit it:

 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 

Thanks for helping me.

Answer 3

Your goal is not clear.

But here my attempt to get your expected 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