SQL ROW TO COLUMN [重复]

Question

我有一张如下表 操作

OPERATOR-OPERATION TYPE
Ahmet   DELETE
Ahmet   UPDATE
Ahmet   READ
Salih   DELETE
Salih   UPDATE
Salih   READ
Salih   READ
Salih   CREATE

什么 SQL 将得到以下结果？简单 COUNT 时，GROUP BY 子句使用 Operation 类型，写成 ROW based。

Name- Total- DELETE- READ- UPDATE  CREATE
Ahmet 3      1       1     1       0
Salih 5      1       2     1       1 

Answer 1

select operator, 
       count(*) as total,
       sum(case when operation_type = 'DELETE' then 1 else 0 end) as deletes,
       sum(case when operation_type = 'UPDATE' then 1 else 0 end) as updates,
       sum(case when operation_type = 'READ' then 1 else 0 end) as reads,
       sum(case when operation_type = 'CREATE' then 1 else 0 end) as creates
from operations
group by operator