如何计算具有不同数据的一列中的总价值

Question

I'm a bit confuse how to name my question title.

Let say my MySQL database table like this. table_group

UserID  UserGroup  UserStatus
------------------------------
1       1          1  
2       1          1 
3       1          2 
4       2          3
5       3          2
6       3          1
7       4          3
9       4          4
10      4          1 

I want to group it by UserGroup and count the UserStatus .

Let me know what is the correct statement to get the result like this

UserGroup  Status_1  Status_2  Status_3  Status_4
-------------------------------------------------
1          2          2        0         0
2          0          0        1         0
3          1          1        0         0
4          1          0        1         1

Answer 1

SELECT UserGroup, count(UserStatus = 1) as Status_1, count(UserStatus = 2) as Status_2,
                  count(UserStatus = 3) as Status_3, count(UserStatus = 4) as Status_4
FROM table_group GROUP BY UserGroup

Answer 2

You could use case to count rows that match a condition:

select  UserGroup
,       count(case when UserStatus = 1 then 1 end) as Status_1
,       count(case when UserStatus = 2 then 1 end) as Status_2
,       count(case when UserStatus = 3 then 1 end) as Status_3
,       count(case when UserStatus = 4 then 1 end) as Status_4
from    table_group
group by
        UserGroup