sql server ¶¨ÒåÖ÷¼ü
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)
Èç¹û ÔÚfatherÖÐûÄܶ¨ÒåÖ÷¼ü£¬
drop table father;
create table father(
id int identity(1,1), (䶨Òå primary key)
name varchar(20) not null,
age int not null
)
Ôò»á±¨ÈçÏÂÒì³££º
ÔÚ±»ÒýÓñí 'father' ÖÐûÓÐÓëÍâ¼ü 'FK_ID' µÄÒýÓÃÁеÄÁÐ±íÆ¥ÅäµÄÖ÷¼ü»òºòÑ¡¼ü
Ïà¹ØÎĵµ£º
SQLÖÐIN,NOT IN,EXISTS,NOT EXISTSµÄÓ÷¨ºÍ²î±ð:
IN:È·¶¨¸ø¶¨µÄÖµÊÇ·ñÓë×Ó²éѯ»òÁбíÖеÄÖµÏàÆ¥Åä¡£
IN ¹Ø¼ü×ÖʹÄúµÃÒÔÑ¡ÔñÓëÁбíÖеÄÈÎÒâÒ»¸öֵƥÅäµÄÐС£
µ±Òª»ñµÃ¾ÓסÔÚ California¡¢Indiana »ò Maryland ÖݵÄËùÓÐ×÷ÕßµÄÐÕÃûºÍÖݵÄÁбíʱ£¬¾ÍÐèÒªÏÂÁвéѯ£º
SELECT ProductID, ProductName from Northwind.dbo.Pro ......
Çë½Ì´ó¼ÒÒ»¸öÓйØSQL½»×¤±¨±í²éѯÎÊÌ⣬»¶Ó¸÷λָ½Ì£¡
ÎÒÏë°Ñͼ1µÄʹÓÃÐÅÏ¢£¬Ê¹ÓÃSQLÓï¾ä£¬ÊµÏÖÈçͼ2µÄ½á¹û¡£
±íÃû
ÐòºÅ
×Ö¶ÎÃû
a
1
c
a
2
d
a
3
e
a
4
f
a
5
g
b
1
h
b
2
i
b
3
j
b
4
k
b
5
l
c
1
m
c
2
n
c
3
o
c
4
p
c
5
q
ͼ1
±íÃû
ÐòºÅ
1
2
3
4
5
......
簡體數據庫轉·±體數據庫µÄ問題 °ÝÍÐÁË
ALTER DATABASE DatabaseName SET SINGLE_USER WITH ROLLBACK IMMEDIATE
ALTER DATABASE DatabaseName COLLATE Chinese_Taiwan_Stroke_CI_AS
ALTER DATABASE DatabaseName SET MULTI_USER WITH ROLLBACK ......
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 ......
ÄãÊÇ·ñÔÚǧ·½°Ù¼ÆÓÅ»¯SQL Server Êý¾Ý¿âµÄÐÔÄÜ?Èç¹ûÄãµÄÊý¾Ý¿âÖк¬ÓдóÁ¿µÄ±í¸ñ£¬°ÑÕâЩ±í¸ñ·ÖÇø·ÅÈë¶ÀÁ¢µÄÎļþ×é¿ÉÄÜ»áÈÃÄãÊÜÒæ·Ëdz¡£SQL Server 2005ÒýÈëµÄ±í·ÖÇø¼¼Êõ£¬ÈÃÓû§Äܹ»°ÑÊý¾Ý·ÖÉ¢´æ·Åµ½²»Í¬µÄÎïÀí´ÅÅÌÖУ¬Ìá¸ßÕâЩ´ÅÅ̵IJ¢Ðд¦ÀíÐÔÄÜÒÔÓÅ»¯²éѯÐÔÄÜ¡£
¡¡¡¡SQL ServerÊý¾Ý¿â±í·ÖÇø²Ù×÷¹ý³ÌÓÉÈý¸ö²½Öè×é³É£º
¡ ......