CREATE TABLE [Test] ( [id] [int] IDENTITY (1, 1) NOT NULL , [name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL , [subject] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL , [Source] [numeric](18, 0) NULL ) ON [PRIMARY] GO INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'语文',60) INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'数学',70) INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'英语',80) INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'数学',75) INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'语文',57) INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'语文',80) INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'英语',100) Go 交叉表语句的实现: --用于:交叉表的列数是确定的 select name,sum(case subject when '数学' then source else 0 end) as '数学', sum(case subject when '英语' then source else 0 end) as '英语', sum(case subject when '语文' then source else 0 end) as '语文' from test group by name
--用于:交叉表的列数是不确定的 declare @sql varchar(8000) set @sql = 'select name,' select @sql = @sql + 'sum(case subject when '''+subject+''' then source else 0 end) as '''+subject+''',' from (select distinct subject from test) as a select @sql = left(@sql,len(@sql)-1) + ' from test group by name' exec(@sql) go select * from test 查询出的结果 name subject source 1 张三 语文 60 2 李四 数学 70 3 王五 英语 80 4 王五 数学 75 5 王五 语文 57 6 李四 语文 80 7 张三 英语 100 --用于:交叉表的列数是确定的 select name,sum(case subject when '数学' then source else 0 end) as '数学', sum(case subject when '英语' then source else 0 end) as '英语', sum(case subject when '语文' then source else 0 end) as '语文' from test group by name 查询出的结果 name 数学 英语 语文 1 李四 70 0 80 2 王五 75 80 57 3 张三 0 100 60
--用于:交叉表的列数是不确定的 declare @sql varchar(8000) set @sql = 'select name,' select @sql = @sql + 'sum(case subject when '''+subject+''' then source else 0 end) as '''+subject+''',' from (select distinct subject from test) as a select @sql = left(@sql,len(@sql)-1) + ' from test group by name' exec(@sql) go 查询的结果也为 name 数学 英语 语文 1 李四 70 0 80 2 王五 75 80 57 3 张三 0 100 60
简单的行转列SQL语句
CREATE TABLE [Test] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[subject] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[Source] [numeric](18, 0) NULL
) ON [PRIMARY]
GO
INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'语文',60)
INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'数学',70)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'英语',80)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'数学',75)
INSERT INTO [test] ([name],[subject],[Source]) values (N'王五',N'语文',57)
INSERT INTO [test] ([name],[subject],[Source]) values (N'李四',N'语文',80)
INSERT INTO [test] ([name],[subject],[Source]) values (N'张三',N'英语',100)
Go
交叉表语句的实现:
--用于:交叉表的列数是确定的
select name,sum(case subject when '数学' then source else 0 end) as '数学',
sum(case subject when '英语' then source else 0 end) as '英语',
sum(case subject when '语文' then source else 0 end) as '语文'
from test
group by name
--用于:交叉表的列数是不确定的
declare @sql varchar(8000)
set @sql = 'select name,'
select @sql = @sql + 'sum(case subject when '''+subject+'''
then source else 0 end) as '''+subject+''','
from (select distinct subject from test) as a
select @sql = left(@sql,len(@sql)-1) + ' from test group by name'
exec(@sql)
go
select * from test
查询出的结果
name subject source
1 张三 语文 60
2 李四 数学 70
3 王五 英语 80
4 王五 数学 75
5 王五 语文 57
6 李四 语文 80
7 张三 英语 100
--用于:交叉表的列数是确定的
select name,sum(case subject when '数学' then source else 0 end) as '数学',
sum(case subject when '英语' then source else 0 end) as '英语',
sum(case subject when '语文' then source else 0 end) as '语文'
from test
group by name
查询出的结果
name 数学 英语 语文
1 李四 70 0 80
2 王五 75 80 57
3 张三 0 100 60
--用于:交叉表的列数是不确定的
declare @sql varchar(8000)
set @sql = 'select name,'
select @sql = @sql + 'sum(case subject when '''+subject+'''
then source else 0 end) as '''+subject+''','
from (select distinct subject from test) as a
select @sql = left(@sql,len(@sql)-1) + ' from test group by name'
exec(@sql)
go
查询的结果也为
name 数学 英语 语文
1 李四 70 0 80
2 王五 75 80 57
3 张三 0 100 60