SQL行列互换很方便
---行转列--pivotcreate table tempTable
(
id int primary key> Student nvarchar(36),
nvarchar(36),
Score int,
)
select * from tempTable
insert into tempTable values ('张三','语文','90')
insert into tempTable values ('张三','语文','89')
insert into tempTable values ('李四','语文','90')
insert into tempTable values ('王五','语文','93')
insert into tempTable values ('张三','数学','89')
insert into tempTable values ('李四','数学','79')
insert into tempTable values ('王五','数学','88')
insert into tempTable values ('张三','英语','87')
insert into tempTable values ('李四','英语','94')
insert into tempTable values ('王五','英语','96')
select Student,sum(语文)as 语文,sum(数学) as 数学,sum(英语) as 英语into tempsubject from tempTable pivot(avg(Score) for in (语文,数学,英语)) as A group by Student order by 语文 desc
---列转行unpivot
select * from tempsubject
unpivot
(
Score for in(语文,数学,英语)
)
as f
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