家有小虎 » SQL http://jiahu.net 我在路上, 你不在身旁. 想你的时候, 温暖依然. Fri, 16 Jul 2010 23:32:14 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 SQL脚本 — 行变列 http://jiahu.net/sql%e8%84%9a%e6%9c%ac-%e8%a1%8c%e5%8f%98%e5%88%97.htm http://jiahu.net/sql%e8%84%9a%e6%9c%ac-%e8%a1%8c%e5%8f%98%e5%88%97.htm#comments Mon, 01 Dec 2008 08:52:31 +0000 o2ho http://cngator.net/?p=829 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

]]> http://jiahu.net/sql%e8%84%9a%e6%9c%ac-%e8%a1%8c%e5%8f%98%e5%88%97.htm/feed 0 在 LinQ 语句中实现 Left Join 操作 http://jiahu.net/%e5%9c%a8-linq-%e8%af%ad%e5%8f%a5%e4%b8%ad%e5%ae%9e%e7%8e%b0-left-join-%e6%93%8d%e4%bd%9c.htm http://jiahu.net/%e5%9c%a8-linq-%e8%af%ad%e5%8f%a5%e4%b8%ad%e5%ae%9e%e7%8e%b0-left-join-%e6%93%8d%e4%bd%9c.htm#comments Thu, 18 Sep 2008 02:23:49 +0000 o2ho http://cngator.net/?p=709 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 });

]]> http://jiahu.net/%e5%9c%a8-linq-%e8%af%ad%e5%8f%a5%e4%b8%ad%e5%ae%9e%e7%8e%b0-left-join-%e6%93%8d%e4%bd%9c.htm/feed 0