SQL Server纵表与横表相互转换的方法

1，纵表转横表

纵表结构 table_a：

转换后的结构：

纵表转横表的sql示例：

select name ,
sum(case when course = n'语文' then grade
else 0
end) as chinese ,
sum(case when course = n'数学' then grade
else 0
end) as mathematics ,
sum(case when course = n'英语' then grade
else 0
end) as english
from dbo.table_a
group by name

2，横表转纵表

横表结构table_b：

转换后的表结构：

横表转纵表的sql示例：

select name ,
'chinese' as course ,
chinese as score
from dbo.table_b
union all
select name ,
'mathematics' as course ,
mathematics as score
from dbo.table_b
union all
select name ,
'english' as course ,
english as score
from dbo.table_b
order by name ,
course desc 

 以上所述是www.887551.com给大家介绍的sql server纵表与横表相互转换的实现方法，希望对大家有所帮助