数据表行转列

View Code

 1 create table AllScore(
 2 
 3 id int identity(1,1) primary key,--主键
 4 stu_name varchar(20),--学生名
 5 category varchar(20),--学科
 6 record float,--成绩
 7 )
 8 /*插入数据*/
 9 insert into AllScore(stu_name,category,record)values(\'刘德华\',\'Chinese\',100)
10 insert into AllScore(stu_name,category,record)values(\'刘德华\',\'English\',95)
11 insert into AllScore(stu_name,category,record)values(\'刘德华\',\'Mathmatics\',98)
12 
13 insert into AllScore(stu_name,category,record)values(\'施瓦辛格\',\'Chinese\',90)
14 insert into AllScore(stu_name,category,record)values(\'施瓦辛格\',\'English\',95)
15 insert into AllScore(stu_name,category,record)values(\'施瓦辛格\',\'Mathmatics\',14)
16 
17 insert into AllScore(stu_name,category,record)values(\'太上老君\',\'Chinese\',70)
18 insert into AllScore(stu_name,category,record)values(\'太上老君\',\'English\',95)
19 insert into AllScore(stu_name,category,record)values(\'太上老君\',\'Mathmatics\',57)
20 
21 insert into AllScore(stu_name,category,record)values(\'毕达哥拉斯\',\'Chinese\',60)
22 insert into AllScore(stu_name,category,record)values(\'毕达哥拉斯\',\'English\',95)
23 insert into AllScore(stu_name,category,record)values(\'毕达哥拉斯\',\'Mathmatics\',68)
24 
25 insert into AllScore(stu_name,category,record)values(\'柏拉图\',\'Chinese\',60)
26 insert into AllScore(stu_name,category,record)values(\'柏拉图\',\'English\',95)
27 insert into AllScore(stu_name,category,record)values(\'柏拉图\',\'Mathmatics\',78)
28 
29 insert into AllScore(stu_name,category,record)values(\'亚里士多德\',\'Chinese\',40)
30 insert into AllScore(stu_name,category,record)values(\'亚里士多德\',\'English\',22)
31 insert into AllScore(stu_name,category,record)values(\'亚里士多德\',\'Mathmatics\',25)
32 
33 insert into AllScore(stu_name,category,record)values(\'卢梭\',\'Chinese\',40)
34 insert into AllScore(stu_name,category,record)values(\'卢梭\',\'English\',50)
35 insert into AllScore(stu_name,category,record)values(\'卢梭\',\'Mathmatics\',78)
36 
37 insert into AllScore(stu_name,category,record)values(\'老庄\',\'Chinese\',100)
38 insert into AllScore(stu_name,category,record)values(\'老庄\',\'English\',20)
39 insert into AllScore(stu_name,category,record)values(\'老庄\',\'Mathmatics\',98)
40 
41 -----开始行转列-------
42 declare @sql nvarchar(4000)
43 set @sql=\'Select stu_name \'
44 Select @sql=@sql+\',sum(case when category=\'\'\'+category+ \'\'\' then Record else 0 end) As \'\'\'+category+\'\'\'\'
45 From AllScore Group By category
46 set @sql=@sql+\' From AllScore Group By stu_name\'
47 Print @sql
48 execute sp_executesql @sql

View Code

 1 select *from test
 2 insert into test(score,name,subject) values(80,\'李四\',\'语文\');
 3 insert into test(score,name,subject) values(60,\'李四\',\'数学\');
 4 insert into test(score,name,subject) values(90,\'李四\',\'英语\');
 5 insert into test(score,name,subject) values(80,\'张三\',\'语文\');
 6 insert into test(score,name,subject) values(60,\'张三\',\'数学\');
 7 insert into test(score,name,subject) values(90,\'张三\',\'英语\');
 8 
 9 -----------------------------------------------
10 
11 select max(name) as 姓名, 
12     max(case
13            when subject =\'语文\' then score
14         end )as 语文 ,
15     max(case
16            when subject =\'数学\' then score
17         end )as 数学 ,
18     max(case
19            when subject =\'英语\' then score
20         end )as 英语 
21 from test group by name

 

--方法一：
select distinct name as \'姓名\' ,(select score from test where name=t.name and subject=\'语文\') as \'语文\' ,
(select score from test where name=t.name and subject=\'数学\') as \'数学\',
(select score from test where name=t.name and subject=\'英语\') as \'英语\'
from test as t

--方法二：
select max(name) as 姓名, 
    max(case
           when subject =\'语文\' then score
        end )as 语文 ,
    max(case
           when subject =\'数学\' then score
        end )as 数学 ,
    max(case
           when subject =\'英语\' then score
        end )as 英语 
from test group by name

----方法三：
declare @sql nvarchar(max);
set @sql=\'select name as 姓名\'
select @sql=@sql+\',max(case when subject= \'\'\'+subject+\'\'\' then score end) as \'+subject from test group by subject
select @sql=@sql+\' from test group by name\'
print @sql
exec sp_executesql @sql
select *from test