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use master
if exists(select * from databases where name='¿âÃû')
drop database ¿âÃû
__________________________  ½¨Êý¾Ý¿â½¨±íµÄ»ù±¾¸ñʽ  ___________________________________________
create database ¿âÃû
on primary
(name='student1',filename='·¾¶\student1.mdf',size=10mb, filegrowth=15%),                Ö÷Îļþ
(name='student2',filename='·¾¶\student2.ndf',size=10mb, filegrowth=15%)                 ´ËÎļþ
log on
(name='student1_log',filename='·¾¶\student1.ldf',size=1mb,filegrowth=15%,maxsize=300mb),   ÈÕÖ¾Îļþ
(name='student2_log',filename='·¾¶\student2.ldf',size=1mb,filegrowth=15%,maxsize=300mb)
go
use ¿âÃû
create table ±íÃû
(ÁÐÃû1 Êý¾ÝÀàÐÍ Ö÷¼ü ÊÇ·ñÔö³¤ Ψһ  Ä¬ÈÏ  ÊÇ·ñΪ¿Õ£¬
name varchar  primary key  identity(±íʾÖÖ×Ó£¬Ôö³¤Á¿) unique default  not null,
)
-------------------------½¨Êý¾Ý¿â±íÖ®¼äµÄÔ¼Êø-------------------------------------------------------
            alter table kk add
df ĬÈÏ       constraint  df_sex default(nan) for sex
pk Ö÷¼ü       constraint  pk_ÁÐÃû  primary key(ÁÐÃû)
ck ¼ì²é       constraint  ck_ÁÐÃû  check(len(ÁÐÃû)>=6)
              constraint  ck_ÁÐÃû  check(ÁÐÃû like [email='%@%']'%@%'[/email])
fk Ö÷Íâ¼ü     constraint  fk_Íâ¼üÁÐÃû foreign key(Íâ¼üÁÐÃû) references Ö÷±íÃû£¨Ö÷±íÁУ©
      
uq Ψһ  


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SQL SERVER 2005¹ý³Ì·ÖÒ³

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Create PROCEDURE [dbo].[pt_AspNetPager]
(
@tableName varchar(255), -- ±íÃû
@fieldName varchar(400)= '*', -- ×Ö¶ÎÃû
@strWhere varchar(255) = Null,
@fieldOrder varchar(100), --²»ÄÜΪ¿Õ
@startIndex int ......

Oracle 10g SQL ÓÅ»¯ÔÙѧϰ

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1.Excution Plan
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PlanÊÇ×î»ù±¾µÄµ÷ÓŸÅÄ²»¹ÜÄãµÄµ÷ÓÅ´µµÃÈçºÎÌ ......

oracleÊý¾Ý¿â×Ö¶ÎÀàÐͼ°ÆäÓëJava.sql.TypesµÄ¶ÔÓ¦

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CHAR(size)£º¹Ì¶¨³¤¶È×Ö·û´®£¬×î´ó³¤¶È2000 bytes
VARCHAR2(size)£º¿É±ä³¤¶ÈµÄ×Ö·û´®£¬×î´ó³¤¶È4000 bytes£¬¿É×öË÷ÒýµÄ×î´ó³¤¶È749
NCHAR(size)£º¸ù¾Ý×Ö·û¼¯¶ø¶¨µÄ¹Ì¶¨³¤¶È×Ö·û´®£¬×î´ó³¤¶È2000 bytes
NVARCHAR2(size)£º¸ù¾Ý×Ö·û¼¯¶ø¶¨µÄ¿É±ä³¤¶È×Ö·û´®£¬×î´ó³¤¶È4000 byte
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mysql Ò»ÌõsqlÓï¾äupdate¸üÐÂÁ½¸ö±í

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UPDATE test.table1 t1,test.table2 t2 SET t1.aa='a',t1.bb='b',t2.cc='c',WHERE t1.u_id=t2.u_id AND t1.u_id='1'  £»
table1µÄu_idºÍtable2µÄu_idÊÇÖ÷Íâ¼ü¹ØÏµ ......

Oracle:PL/SQL ÖÐÈçºÎʹÓÃArray

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ÒòΪÔÚPL/SQL Öв¢Ã»ÓÐÊý×é.
ÕâÊÇż²é×ÊÁÏÕҵķ¶ÀýºÍ×Ô¼ºÐ´µÄ·¶ÀýÀ´½âÊÍÈçºÎÔÚPL/SQL ÖÐʹÓÃÊý×é. Ò²ÐíºÜ¶àÈËÒÑÖªµÀ, ²»¹ý¾ÍÊÇÈò»ÖªµÀµÄÅóÓÑÃÇÁ˽âһϰɡ£
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DECLARE
TYPE
emp_ssn_array IS TA ......
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