我不明白我是如何从下表中得到预期结果的

Question

  

这是我的桌面拍摄

  

我需要下面的结果 -

  

我使用了以下查询

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)

  

我没有得到我的预期结果。

     

请帮帮我

     

对不起我的英语，我没有足够的声誉，这就是为什么我无法附上样本图片

Answer 1

你可以做条件和

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)) 您可以使用

group by `Year_month`