MSSQLServer 纵向表转横向表 横向表转纵向表
建表语句及插入数据语句:
CREATE TABLE Test_y(
[Name] [nchar](10) NULL,
[Course] [nchar](10) NULL,
[Grade] [int] NULL
)
insert into Test_y values (‘张三‘,‘语文‘,75);
insert into Test_y values (‘张三‘,‘数学‘,80);
insert into Test_y values (‘张三‘,‘英语‘,90);
insert into Test_y values (‘李四‘,‘语文‘,90);
insert into Test_y values (‘李四‘,‘数学‘,70);
insert into Test_y values (‘李四‘,‘英语‘,80);CREATE TABLE Test_x(
[Name] [nchar](10) NULL,
[语文] [nchar](10) NULL,
[数学] [nchar](10) NULL,
[英语] [nchar](10) NULL
)
insert into Test_x values(‘张三‘,75,80,90);
insert into Test_x values(‘李四‘,90,70,80);
纵向表转横向表效果展示:
纵向表转横向表 sql 语句如下:
方法一:
select * from Test_y;
select Name,
sum(case Course when ‘语文‘ then Grade else 0 end) as 语文,
sum(case Course when ‘数学‘ then Grade else 0 end) as 数学,
sum(case Course when ‘英语‘ then Grade else 0 end) as 英语
from Test_y group by Name;
方法二:
select * From Test_y
pivot(sum(Grade) for Course IN ([语文],[数学],[英语]))
AS Test_x;
横向表转纵向表效果展示:
横向表转纵向表 sql 语句如下:
方法一:
select * from Test_x;
select Name,‘语文‘ as Course,语文 as Grade
from Test_x union all
select Name,‘数学‘ as Course,数学 as Grade
from Test_x union all
select Name,‘英语‘ as Course,英语 as Grade
from Test_x order by Name desc;
方法二:
select Name,Course,Grade from Test_x
unpivot(Grade for Course in([数学],[英语],[语文]))as Test_y
最后谢谢 @漠北水獭 的提示。
新手学习,高手忽略不计即可;
.net技术交流群:70895254
MSSQLServer 纵向表转横向表 横向表转纵向表 行转列 列转行
时间: 2024-11-18 13:18:43