我想MySQL查詢結果在同一行中

Question

SELECT sum(case when (gender)=1 THEN 1 ELSE 0 END), 
     GROUP_CONCAT(sum(case when (gender)=2 THEN 1 ELSE 0 END) SEPARATOR ' ') as combine   
from family_member_tbl 
GROUP BY gender 

Answer 1

不，你不能嵌套這樣的分組功能。寧可拿到總額，然後group_concat()像

select sum_1, sum_2, group_concat(sum_2) as combine 
from (
SELECT gender, 
     sum(case when gender = 1 THEN 1 ELSE 0 END) as sum_1, 
     sum(case when gender = 2 THEN 1 ELSE 0 END) as sum_2   
from family_member_tbl 
GROUP BY gender) xxx 
group by gender;