Received: from LV.Levels.UniSA.Edu.Au (SYSTEM@LV.levels.unisa.edu.au [130.220.16.6]) by hub.org (8.9.1/8.9.1) with ESMTP id WAA20974 for ; Mon, 4 Jan 1999 22:43:27 -0500 (EST) (envelope-from cisjl@cs.unisa.edu.au) Received: from ares.levels.unisa.edu.au (root@Ares.levels.unisa.edu.au) by Levels.UniSA.Edu.Au (PMDF V5.1-10 #27872) with SMTP id <01J66NHDB02A98A2VO@Levels.UniSA.Edu.Au> for pgsql-docs@postgresql.org; Tue, 5 Jan 1999 14:13:20 +0930 Received: from cs.unisa.edu.au by ares.levels.unisa.edu.au (SMI-8.6/SMI-SVR4) id OAA09929; Tue, 05 Jan 1999 14:11:21 +1030 Date: Tue, 05 Jan 1999 14:16:35 +1030 From: Jixue Jerry Liu Subject: questions To: pgsql-docs@postgresql.org Message-id: <36918B1B.3DF29E2F@cs.unisa.edu.au> Organization: UniSA MIME-version: 1.0 X-Mailer: Mozilla 4.5 [en] (Win95; I) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Accept-Language: en Dear Sir/Madam, My name is Jixue Liu, a PhD student in the School of Computer Science, University of South Australia. I am studying view maintenance in OR Systems. The model I study most and the system I use is Postgres. I appreciate Postgres group for the contribution to the field. Now I have some questions about the usage of the system. 1. How to define a relation with an attribute which takes values of sets of strings? 2. What is the syntax to define a table referring another table? 3. How to use the number in pg_inherits to get relation names? I am looking forward to hearing from you. Jixue Liu