MSSQLServer 纵向表转横向表 横向表转纵向表 行转列 列转行
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。
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