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Article #1766Re: ��һ������SQL���������
From: ����
Date: Tue, 06 Dec 2005 12:05
Date: Tue, 06 Dec 2005 12:05
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1309 bytes
�����ַ��� (1)������ alter table table_name add primarykey(a,b); (2)��Ψһ���� create unique index index_name on table_name(col1,col2); ����Ψһ�����ǿ���Ϊnull��,���Ǹ��������� �� �� rubing (���) �Ĵ������ᵽ: �� : ����ͨ��SQL�������ݿ��н����� : �뽫�����ֶ����ó�����������ݲ�Ψһ : ��������� -- [m[35m�� ��Դ:��BBS Ȫ������վ http://bbs.sdu.edu.cn��[FROM: 202.194.31.*][m
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X-Google-Thread: 101948,b73e2d3b523b5a5c,start X-Google-Attributes: gid101948,public X-Google-Language: Chinese,GB Path: arc1-ca.pugleaf.net!g2news1.google.com!news3.google.com!newsfeed2.dallas1.level3.net!news.level3.com!bloom-beacon.mit.edu!news.cn99.com!SDU From: marking@bbs.sdu.edu.cn-SPAM.no (����) Newsgroups: cn.bbs.comp.database Subject: Re: ��һ������SQL��������� Date: 06 Dec 2005 12:05:51 GMT Organization: Ȫ������_BBS Message-ID: <4LSZJF$f88@bbs.sdu.edu.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 8bit X-Filename: Database/M.1133870751.r0