Question

我有这样的主表。

[！[在此处输入图片描述] [1]] [1]

输出为

[！[在此处输入图片描述] [2]] [2]

我该怎么做才能得到这样的输出？

Answer 1

您可以尝试像使用GROUP BY和UNION ALL一样。

select  count(*) CT,Mark
from TableName
group by Mark
union all
select Count(*), 'A+B' as mark
from TableName
where mark in('A','B')
UNION ALL
select Count(*), 'A+C' as mark
from TableName
where mark in('A','C')
union all
select Count(*), 'B+C' as mark
from TableName
where mark in('B','C')
UNION ALL
select Count(*), 'A+B+C' as mark
from TableName

Answer 2

执行cross join和union all

select mark,count(*) as cnt 
from cte group by mark
union all
 select concat(a.mark,'+',b.mark) as mark,a.cnt+b.cnt as cnt from
(select mark,count(*) as cnt 
from cte group by mark
) a cross join
(
select mark,count(*) as cnt 
from cte group by mark
) b where a.mark<b.mark
union all

select 'A+B+C' ,sum(cnt)
from 
(
select mark,count(*) as cnt 
from cte group by mark
) a

输出

 mark   cnt
   A    1
   B    1
   C    2
  A+B   2
  A+C   3
  B+C   3
  A+B+C 4

demo fiddle link

如何使这样的SQL脚本？

2 个答案: