汇总汇总数据

Question

我有一个如下表:

SoftwareName    Count    Country
Project         15       Canada
Visio           12       Canada
Project         10       USA
Visio           5        USA

如何查询它给我一个总结,如...

SoftwareName    Canada    USA    Total
Project         15        10     25
Visio           12        5      17

怎么做T-SQL？

Answer 1

SELECT SoftwareName, 
  SUM( CASE Country WHEN 'Canada' THEN [Count] ELSE 0 END ) AS Canada,
  SUM( CASE Country WHEN 'USA'    THEN [Count] ELSE 0 END ) AS USA,
  SUM( [Count] ) AS Total
FROM [Table] 
GROUP BY SoftwareName;