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SQL-Structured Query Language
--(¿ªÆôSQL·þÎñ£ºnet start mssqlserver)
--(ÔÚÃüÁîÐÐÖÐÊäÈë'sqlwb'ÃüÁî¿É´ò¿ªSQL¹ÜÀíÆ÷ )
--(Èç¹ûÒªÖ´ÐжàÌõÃüÁîÖеÄÒ»Ìõ,Êó±êÑ¡¶¨ºóÔÙ°´F5Ö´ÐÐ)
create database sales                           --´´½¨Ò»¸öÃûΪsalesµÄÊý¾Ý¿â
on
(
name='sales_data',
filename='d:\sales_data.mdf',
size=10,
maxsize=50,
filegrowth=5
)
log on
(
name='sales_log',
filename='d:\sales_log.ldf',
size=10,
maxsize=50,
filegrowth=5
)
drop database sales                             --ɾ³ýËù´´½¨µÄÊý¾Ý¿â
sp_helpdb sales                                 --²é¿´Êý¾Ý¿âµÄÏà¹ØÐÅÏ¢
sp_helpfile                                     --²é¿´µ±Ç°Êý¾Ý¿âÊý¾ÝÎļþÓëÈÕÖ¾ÎļþµÄÏà¹ØÐÅÏ¢
sp_detach_db sales                              --×ªÒÆÊý¾Ý¿âʱ·ÖÀëÊý¾Ý¿â
sp_attach_db sales,@filename1='Êý¾ÝÎļþ·¾¶Ãû'  --ÕûºÏ·ÖÀëµÄÊý¾Ý¿â                 
                  ,@filename2='ÈÕÖ¾Îļþ·¾¶Ãû'
--(ÈçºÎ¼õСÊý¾Ý¿âÈÕÖ¾ÎļþµÄ´óС:  a.·ÖÀëÊý¾Ý¿â b.×ªÒÆÈÕÖ¾Îļþ c .ÕûºÏÊý¾Ý¿âµ«²»Ö¸¶¨ÈÕÖ¾Îļþ)
--Êý¾Ý¿âµÄ±¸·Ý
sp_addumpdevice 'disk','mydisk','d:\sales.bak'  --Ìí¼ÓÉ豸¡


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/*±í½á¹¹
id  cityid  major
1   1         A
2   1         B
3   2        ......

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       Ïà¹Ø²âÊÔʵÀýÈçÏ£º
use tempdb
go
if (object_id ('t1' ) is not null ) drop table t1
if (object_id ('t2' ) is not null ) drop table t2
go ......

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/**********************************/
--»ñµÃijһÌìËùÔÚÄêµÄµÚÒ»Ìì
declare @a datetime,@b datetime,@sum int,@num int,@res varchar(20)
select @a='1-6-1968'
select @b='2006-4-8'
select @sum=year(@a)
select @res=ltrim(cast(@sum as ......

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