php - 如何在mysql中编写如下查询来获取数据？

Question

我有一个这样的tbl_users

Uid       Fname     createddate    Active(0:inactive;1:active;2:pending)

1        user1      2014-12-14     1                              
2        user2      2013-11-18     0  
3        user3      2014-12-14     1

我想要的是......

基于日期，有多少用户处于活跃、不活跃和待定状态？

array(

[0]=>array(
      [date]=>2014-12-14
      [active]=2
      [inactive]=0
      [pending]=0
     )
[1]=>array(
      [date]=>2013-11-18
      [active]=0
      [inactive]=1
      [pending]=0
     )

 )

Answer 1

在Mysql中，条件求和很简单，可以表示为

select
createddate,
sum( Active = 1 ) as `active`,
sum( Active = 0 ) as `inactive`,
sum( Active = 2 ) as `pending`
from tbl_users
group by createddate