SqlServer行转列关键字——Pivot

declare @sql varchar(1000)
declare @col varchar(1000)
select @col = ISNULL(@col + ‘,‘,‘‘) + QUOTENAME(r.Name) from dbo.[User] u inner join dbo.[Role] r on u.RoleID = r.ID group by r.Name --先确定要转换的列名
print @col
set @sql = ‘
select * from (
    select u.ID, r.Name, u.UserName from dbo.[User] u join dbo.[Role] r on u.RoleID = r.ID
) rg  pivot (max(UserName) for rg.Name in (‘ + @col + ‘)) as pvt‘
print(@sql)
exec(@sql)