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Article #174Re: ��ô��spl���ƶ�ƽ��
From: Galaxy��VOLUNTEERS��Database
Date: Fri, 17 Jul 2009 07:44
Date: Fri, 17 Jul 2009 07:44
26 lines
2064 bytes
2064 bytes
���������ѯ: Select sum(Price) from Table1 where ID between b.ID and b.ID-4)/ iif(ID>5,5,ID) ����˼��: ���ID>5,�ͽ�ID-4��ID�еļ۸�Price�ܺͳ���5 ���ID<=5,��ô�ͽ�1��ID�еļ۸�Price�ܺͳ�������(Ҳ����ID����ֵ) ID��һ��������,�۸������Ҫ����ļ۸���� �� �� Dem (Galaxy ��VOLUNTEERS��Database) �Ĵ������ᵽ: ��: �������������Ϊ���� : ��ǰ����һ���? : http://bbs.sjtu.edu.cn/file/database/124781641449192.jpg : Ȼ��ʹ�����²�ѯ�� : SELECT ID, Price, (Select sum(Price) from Table1 where ID between b.ID and : b.ID-4)/ iif(ID>5,5,ID) AS MovingAvg : FROM Table1 AS b; : ������£� : http://bbs.sjtu.edu.cn/file/database/124781643649390.jpg : �� �� Cissnei (СC�Ů���ʹ��Smiling : .................������ʡ�ԣ� -- Welcome to Database Board ��ӭ������ݿ�� http://bbs.sjtu.edu.cn/bbsdoc?board=database [m[1;32m�� ��Դ:����ˮ˼Դ bbs.sjtu.edu.cn��[FROM: 207.46.55.27][m
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arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!news.glorb.com!feeder.erje.net!news2.arglkargh.de!news.musoftware.de!wum.musoftware.de!weretis.net!feeder2.news.weretis.net!newsfeed01.sul.t-online.de!t-online.de!news.cn99.com!news.shec6.edu.cn!SJTUShow Full Headers
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X-Google-Thread: 4df683fd51,cd44c281e07e426b,start X-Google-Attributes: gid4df683fd51,public,usenet X-Google-NewGroupId: yes X-Google-Language: Chinese,GB Path: arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!news.glorb.com!feeder.erje.net!news2.arglkargh.de!news.musoftware.de!wum.musoftware.de!weretis.net!feeder2.news.weretis.net!newsfeed01.sul.t-online.de!t-online.de!news.cn99.com!news.shec6.edu.cn!SJTU From: Dem.bbs@bbs.sjtu.edu.cn (Galaxy��VOLUNTEERS��Database) Newsgroups: cn.bbs.comp.database Subject: Re: ��ô��spl���ƶ�ƽ�� Date: 17 Jul 2009 07:44:44 GMT Organization: ��ˮ˼Դ Message-ID: <4h334f$bad@bbs.sjtu.edu.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 8bit X-Filename: database/M.1247816681.A Lines: 26