Access and SQL Server 中的表转置
样表如下：
| ID | sName | Subject | Score |
|---|---|---|---|
| 1 | 张三 | Chinese | 80 |
| 2 | 张三 | Math | 90 |
| 3 | 张三 | English | 85 |
| 4 | 李四 | Chinese | 85 |
| 5 | 李四 | Math | 92 |
| 6 | 李四 | English | 82 |
Access：
TRANSFORM Avg(Student.Score) AS ScoreOfAvg
SELECT Student.sName
FROM Student
GROUP BY Student.sName
PIVOT Student.Subject;
SQL Server:
Select sName,
Avg(case when Subject=‘Chinese‘ then Score end) As ‘Chinese‘,
Avg(case when Subject=‘English‘ then Score end) As ‘English‘,
Avg(case when Subject=‘Math‘ then Score end) As ‘Math‘
From Student
Group By sName
| sName | Chinese | English | Math |
|---|---|---|---|
| 李四 | 85 | 82 | 92 |
| 张三 | 80 | 85 | 90 |
升级版：
declare @s varchar(8000),@l varchar(8000)
Set @s=‘‘
Select @s=@s +‘, Avg(case Subject when ‘‘‘+ Subject+‘‘‘ then Score else 0 end) As [‘+Subject+‘]‘ From Student Group By Subject
Set @l=‘Select sName‘ +@s+‘From Student Group By sName ORDER BY sName‘
Exec (@l)
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