SQL ROW TO COLUMN

Question

我有一张表如下 OPERATIONS

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

将获得以下结果的SQL是什么？当简单的COUNT，GROUP BY子句使用Operation类型写成基于ROW。

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