mysql - 我不明白如何从下表中得到预期结果

Question

This is my table screen shoot

I need result like below-

I used below query

select date(added_datetime), 
   (select count(social_network) from social_user where social_network = 'FBuser') as FB, 
   (select count(social_network) from social_user where social_network = 'LIuser') as LI, 
   (select count(social_network) from social_user where social_network = 'TWuser') as TW, 
   (select count(social_network) from social_user where social_network = 'GPuser') as GP 
 from social_user group by MONTH(added_datetime)

I is not getting my my expected result.

Please help me

Sorry for my English and I don't have enough reputation that's why I can not attached sample picture

Answer 1

您可以进行条件求和

select
concat(date(added_datetime),MONTH(added_datetime)) as `Year_month`,
sum(social_network = 'FBuser') as FB,
sum(social_network = 'LIuser') as LI,
sum(social_network = 'TWuser') as TW,
sum(social_network = 'GPuser') as GP
from social_user 
group by concat(date(added_datetime),MONTH(added_datetime))

编辑: 而不是 group by concat(date(added_datetime),MONTH(added_datetime)) 您可以用作

group by `Year_month`