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eg:
select * from Exception_Log where DATEDIFF(day,OPER_DATE,getdate())<30 ;
/*
oper_date Ϊ±íÖвéѯ³öÀ´µÄʱ¼ä
getdate()ΪSQLServerÀïÃæ»ñµÃϵͳʱ¼äµÄº¯Êý
º¬Ò壺µ±Ç°Ê±¼ä-²éѯ³öÀ´µÄʱ¼äСÓÚ30Ìì
DateDiff¾ßÌåÓ÷¨£º
*/
DateDiff º¯Êý
·µ»ØÁ½¸öÈÕÆÚÖ®¼äµÄʱ¼ä¼ä¸ô¡£
DateDiff(interval, date1, date2 [,firstdayofweek[, firstweekofyear]])
DateDiff º¯ÊýµÄÓï·¨ÓÐÒÔϲÎÊý£º
²ÎÊý
interval
±ØÑ¡Ïî¡£String expression ±íʾÓÃÓÚ¼ÆËã date1 ºÍ date2 Ö®¼äµÄʱ¼ä¼ä¸ô¡£ÓйØÊýÖµ£¬Çë²ÎÔÄ“ÉèÖÔ²¿·Ö¡£
date1, date2
±ØÑ¡Ïî¡£ÈÕÆÚ±í´ïʽ¡£ÓÃÓÚ¼ÆËãµÄÁ½¸öÈÕÆÚ¡£
Firstdayofweek
¿ÉÑ¡Ïî¡£Ö¸¶¨ÐÇÆÚÖеÚÒ»ÌìµÄ³£Êý¡£Èç¹ûûÓÐÖ¸¶¨£¬ÔòĬÈÏΪÐÇÆÚÈÕ¡£ÓйØÊýÖµ£¬Çë²ÎÔÄ“ÉèÖÔ²¿·Ö¡£
Firstweekofyear
¿ÉÑ¡Ïî¡£Ö¸¶¨Ò»ÄêÖеÚÒ»Öܵij£Êý¡£Èç¹ûûÓÐÖ¸¶¨£¬ÔòĬÈÏΪ 1 Ô 1 ÈÕËùÔÚµÄÐÇÆÚ¡£ÓйØÊýÖµ£¬Çë²ÎÔÄ“ÉèÖÔ²¿·Ö¡£
ÉèÖÃ
interval ²ÎÊý¿ÉÒÔÓÐÒÔÏÂÖµ£º
ÉèÖà  ÃèÊö
yyyy  Äê
q  ¼¾¶È
m  ÔÂ
y  Ò»ÄêµÄÈÕÊý
d  ÈÕ
w  Ò»ÖܵÄÈÕÊý
ww ÖÜ
h  Ð¡Ê±
n  ·ÖÖÓ
s  Ãë
firstdayofweek ²ÎÊý¿ÉÒÔÓÐÒÔÏÂÖµ£º
³£Êý   Öµ  ÃèÊö
vbUseSystem 0  Ê¹ÓÃÇøÓòÓïÑÔÖ§³Ö (NLS) API ÉèÖá£
vbSunday  1  ÐÇÆÚÈÕ£¨Ä¬ÈÏ£©
vbMonday  2  ÐÇÆÚÒ»
vbTuesday  3  ÐÇÆÚ¶þ
vbWednesday 4  ÐÇÆÚÈý
vbThursday  5  ÐÇÆÚËÄ
vbFriday  6  ÐÇÆÚÎå
vbSaturday  7  ÐÇÆÚÁù
firstweekofyear ²ÎÊý¿ÉÒÔÓÐÒÔÏÂÖµ£º
³£Êý    Öµ  ÃèÊö
vbUseSystem  0  Ê¹ÓÃÇøÓòÓïÑÔÖ§³Ö (NLS) API ÉèÖá£
vbFirstJan1  1  ÓÉ 1 Ô 1 ÈÕËùÔÚµÄÐÇÆÚ¿ªÊ¼£¨Ä¬ÈÏ£©¡£
vbFirstFourDays  2  ÓÉÔÚÐÂÄêÖÐÖÁÉÙÓÐËÄÌìµÄµÚÒ»ÖÜ¿ªÊ¼¡£
vbFirstFullWeek  3  ÓÉÔÚеÄÒ»ÄêÖеÚÒ»¸öÍêÕûµÄÖÜ¿ªÊ¼¡£
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DateDiff º¯ÊýÓÃÓÚÅжÏÔÚÁ½¸öÈÕÆÚÖ®¼ä´æÔÚµÄÖ¸¶¨Ê±¼ä¼ä¸ôµÄÊýÄ¿¡£ÀýÈç¿ÉÒÔʹÓà DateDiff ¼ÆËãÁ½¸öÈÕÆÚÏà²îµÄÌìÊý£¬»òÕßµ±Ììµ½µ±Äê×îºóÒ»ÌìÖ®¼äµÄÐÇÆÚÊý¡£
Òª¼ÆËã date1 ºÍ date2 Ïà²îµÄÌìÊý£¬¿ÉÒÔʹÓÓһÄêµÄÈÕÊý”£¨“y”£©»ò“ÈÕ”£¨“d”£©¡£µ± inter


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sqlserver 2005 split function

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
create function [dbo].[split](@str nvarchar(1000),@word varchar(5),@no
int) returns nvarchar(500)
as begin
    declare @len int
    declare @index int
    set @index=charindex(@word,@str)
   ......

oracleºÍsqlserver²éѯʱ×èÈûÇé¿ö

1.oracle»·¾³
create table test
(
id number(4),
name varchar2(20)
)
ÔÚÒ»¸ösessionÖÐ
insert into test values(1,'aa');
ÔÚÁíÒ»¸ösessionÖÐ
select * from test1;
²éѯû±»×èÈû
2.sqlserver»·¾³
ÔÚÒ»¸ösessionÖÐ
insert into test values(1,'aa');
ÔÚÁíÒ»¸ösessionÖÐ
select * from test1;
²éѯ±»×èÈû(Ê ......

SQLServerÔ¶³Ì·ÃÎÊÅäÖÃ

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SQLSERVERÓû§È¨ÏÞ¹ÜÀíÊý¾Ý¿â

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1.SQL Server·þÎñÆ÷µÇ¼¹ÜÀí
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