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drop table father;
create table father(
 id int identity(1,1) primary key,
 name varchar(20) not null,
 age int not null
  
)
drop table mother;
create table mother(
 id int identity(1,1),
 name varchar(20) not null,
 age int not null,
 husband int not null
)
alter table mother
  add constraint FK_ID foreign key(husband) references father(id)
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drop table father;
create table father(
 id int identity(1,1),   (䶨Òå primary key)
 name varchar(20) not null,
 age int not null
)
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ÔÚ±»ÒýÓñí 'father' ÖÐûÓÐÓëÍâ¼ü 'FK_ID' µÄÒýÓÃÁеÄÁÐ±íÆ¥ÅäµÄÖ÷¼ü»òºòÑ¡¼ü


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1¡¢µÇ¼Êý¾Ý¿âµÄ·½Ê½ÎªSQL ServerÑé֤ģʽ
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server=·þÎñÆ÷Ãû;database=Êý¾Ý¿âÃû³Æ;Integrated Security=SSPI
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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_movefile]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[p_movefile]
GO
/*--ÒÆ¶¯·þÎñÆ÷ÉϵÄÎļþ
 ²»½èÖú xp_cmdshell ,ÒòΪÕâ¸öÔÚ´ó¶àÊýʱºò¶¼±»½ûÓÃÁË
--×Þ½¨ 2004.08(ÒýÓÃÇë±£Áô´ËÐÅÏ¢)--*/
/*--µ÷ÓÃʾÀý ......

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use Master 
go 
if object_id('SP_SQL') is not null 
  drop proc SP_SQL 
go 
create proc [dbo].[SP_SQL](@ObjectName sysname) 
as 
set nocount on ; 
declare @Print varchar(max) 
if exists(select 1 from syscomments  where ID=objec ......

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1¡¢ËµÃ÷£º¸´ÖƱí(Ö»¸´Öƽṹ,Ô´±íÃû£ºa бíÃû£ºb) (Access¿ÉÓÃ)
·¨Ò»£ºselect * into b from a where 1 <>1
·¨¶þ£ºselect top 0 * into b from a
2¡¢ËµÃ÷£º¿½±´±í(¿½±´Êý¾Ý,Ô´±íÃû£ºa Ä¿±ê±íÃû£ºb) (Access¿ÉÓÃ)
insert into b(a, b, c) select d,e,f from b;
3¡¢ËµÃ÷£º¿çÊý¾Ý¿âÖ®¼ä±íµÄ¿½±´(¾ßÌåÊý¾ÝʹÓà ......

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ÀýÈ磬ÏÂÃæµÄÓï¾ä²éѯtesttable±íÖÐÐÕÃûΪ“ÕÅÈý”µÄnickname×ֶκÍemail×ֶΡ£
SELECT nickname,email
from testtable
WHERE name='ÕÅÈý'
 
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