Article View: cn.bbs.comp.database
Article #1383Re: ���һ����ѯЧ�����⡫
From: Hien
Date: Mon, 27 Aug 2007 12:58
Date: Mon, 27 Aug 2007 12:58
19 lines
1709 bytes
1709 bytes
�Ҿ����Լ�дdistinct���Ӹ���ݿ��Ч�ʲ���Ǻܴ�,����˵�Լ�д����Щ,��Ϊ���� �ĵ���ʱ�����ϵͳ��Դ��. �� �� hhriver (Double.H) �Ĵ������ᵽ: �� : sql server : select * from tableA where id IN (1,2,3) : select * from tableA where id IN (1,2,3,1,1,1,1,1) : ���ߵIJ�ѯʱ���кܴ���ô : Ҳ����˵��in�ķ�Χ���кܶ��ظ�Ԫ�أ���ݿ��Ƿ��л�����distinctһ�£��ٲ�ѯ�� : ���Լ�д����distinctЧ�ʸߣ�����ֱ���Ӹ���ݿ�Ч�ʸ��أ� -- ������������������ ����Ҫȥ�ĵط� ��ô�ܹ���·�ͷ��� http://bbs.sjtu.edu.cn/file/test/1186758618135190.jpg [m[1;36m�� ��Դ:����ˮ˼Դ bbs.sjtu.edu.cn��[FROM: 59.78.22.125][m
Technical Details
Message-ID:
<4Ve8Ad$c0k@bbs.sjtu.edu.cn>Path:
arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!213.200.89.82.MISMATCH!tiscali!newsfeed1.ip.tiscali.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!news.cn99.com!bbsnews.sdu.edu.cn!SJTUBBSShow Full Headers
Complete Article Headers
X-Google-Thread: 101948,b7888ec670741ebf,start X-Google-Attributes: gid101948,public,usenet X-Google-Language: Chinese,GB Path: arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!213.200.89.82.MISMATCH!tiscali!newsfeed1.ip.tiscali.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!news.cn99.com!bbsnews.sdu.edu.cn!SJTUBBS From: HienChu.bbs@bbs.sjtu.edu.cn (Hien) Newsgroups: cn.bbs.comp.database Subject: Re: ���һ����ѯЧ�����⡫ Date: 27 Aug 2007 12:58:58 GMT Organization: ��ˮ˼Դ Message-ID: <4Ve8Ad$c0k@bbs.sjtu.edu.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 8bit X-Filename: database/M.1188219399.A Lines: 19