SQL脚本 — 行变列

@ouc — Mon, 01 Dec 2008 08:52:31 +0000

create table aaa
(
col nvarchar(10)
)

insert into aaa
select 1
union
select 2
union
select 3

declare @sql varchar(8000)
set @sql=’select ‘
select @sql=@sql+’max(case col when ”’+ col +”’ then col end) + ”,” + ‘
from (select distinct col from aaa) a
set @sql=left(@sql,len(@sql)-1)

set @sql=@sql+’ from aaa’
–print @sql
exec(@sql)

drop table aaa

在 LinQ 语句中实现 Left Join 操作

@ouc — Thu, 18 Sep 2008 02:23:49 +0000

var query = (from p in dc.GetTable<Person>()
join pa in dc.GetTable<PersonAddress>() on p.Id equals pa.PersonId into tempAddresses
from addresses in tempAddresses.DefaultIfEmpty(new PersonAddress())
select new { p.FirstName, p.LastName, addresses.State });

家有小虎 » SQL

SQL脚本 — 行变列

在 LinQ 语句中实现 Left Join 操作