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xtype ´ú±íÀàÐÍ 
C = CHECK Ô¼Êø 
D = ĬÈÏÖµ»ò DEFAULT Ô¼Êø 
F = FOREIGN KEY Ô¼Êø 
L = ÈÕÖ¾ 
FN = ±êÁ¿º¯Êý 
IF = ÄÚǶ±íº¯Êý 
P = ´æ´¢¹ý³Ì 
PK = PRIMARY KEY Ô¼Êø£¨ÀàÐÍÊÇ K£© 
RF = ¸´ÖÆɸѡ´æ´¢¹ý³Ì 
S = ϵͳ±í 
TF = ±íº¯Êý 
TR = ´¥·¢Æ÷ 
U = Óû§±í 
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Oracle,MySQL,MSSQL ServerºÍAccessÊý¾Ý¿âµÄͳ¼Æº¯Êý
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±ê׼ƫ²î(Standard Deviation)
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MssqlÖÐʵÏÖÓÃÕýÔò±í´ïʽ¸üÐÂ×Ö¶ÎÖµ

create   function   dbo.regexReplace  
  (  
  @source   varchar(5000),         --Ô­×Ö·û´®  
  @regexp   varchar(1000),         - ......

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ÍøÕ¾¸ü»»¿Õ¼äµÄʱºò£¬¾­³£»áÒòΪMSSQLÊý¾Ý¿âÃû²»Í¬£¬µ¼Ö´Ӿɿռ䱸·ÝµÄÊý¾Ý¿âÔÚпռ仹ԭºóÎÞ·¨Õý³£Ê¹Óá£Õâʱºò£¬ÎÒÃÇ¿ÉÒÔͨ¹ý½«Êý¾Ý¿â±íµÄËùÓÐÕßÐÞ¸ÄΪ"dbo"À´½â¾öÕâ¸öÎÊÌ⣬¾ßÌåµÄ·½·¨ÈçÏ£º
´ò¿ª"Microsoft SQL Server"µÄ“ÆóÒµ¹ÜÀíÆ÷”£¬µã¿ªÒªÐ޸ĵÄÊý¾Ý¿â£¬Ñ¡Ôñ¹¤¾ßÀ¸Éϵē¹¤¾ß” ......

mssql´æ´¢¹ý³Ìas֮ǰ֮ºóµÄ±äÁ¿ÉêÃ÷ÓÐʲôÇø±ð£¿

create    PROCEDURE zdy_CBFY (@SFSS VARCHAR(1),@DWBH varchar(20),@KMBH VARCHAR(10),@KJND VARCHAR(4))
AS
DECLARE @ZWkmye  varchar(20),@zwkmzd  varchar(20),@ZWSSKMYE  varchar(20)
set @zwkmye='zwkmye'+@kjnd
SET @ZWKMZD='ZWKMZD'+@KJND
SET @ZWSSKMYE='ZWSSKMYE'+@KJND
Æä ......

ʵÏÖ¶àÐкϲ¢Ò»ÐеÄSQL [MSSQL2005]д·¨

--1. ´´½¨±í£¬Ìí¼Ó²âÊÔÊý¾Ý
CREATE TABLE tb(id int, [value] varchar(10))
INSERT tb SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'
--SELECT * from tb
/**//*
id value
----------- ----------
1 aa
1 bb
2 aaa ......
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