Path: news.cambrium.nl!textnews.cambrium.nl!feeder1.cambriumusenet.nl!feed.tweaknews.nl!209.197.12.242.MISMATCH!nx01.iad01.newshosting.com!newshosting.com!post02.iad!news.aliant.net!not-for-mail Date: Mon, 31 Aug 2009 12:44:23 -0300 From: Bob Badour User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.databases.theory Subject: Re: more on delete from join References: <8b751f60-779b-4cdd-8361-8ab27cdc4ea0@e27g2000yqm.googlegroups.com> <52Ylm.41248$Db2.9996@edtnps83> <4a986869$0$23762$9a566e8b@news.aliant.net> <4a993f13$0$23766$9a566e8b@news.aliant.net> <385686bf-7bdc-4ba8-9233-377d94ed7e4a@p36g2000vbn.googlegroups.com> <2b128d1f-7303-4890-b591-45868329f4d9@g1g2000pra.googlegroups.com> <486f53f2-10fd-4d4b-af45-be256f187ed3@r34g2000vba.googlegroups.com> <4a9ade0b$0$23762$9a566e8b@news.aliant.net> <7669561e-6451-4638-89fc-c5ac24375323@o36g2000vbl.googlegroups.com> <4a9af020$0$23747$9a566e8b@news.aliant.net> <52f143b7-f232-4c45-9acc-86c660ffeed5@m3g2000pri.googlegroups.com> In-Reply-To: <52f143b7-f232-4c45-9acc-86c660ffeed5@m3g2000pri.googlegroups.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Antivirus: avast! (VPS 090830-0, 08/30/2009), Outbound message X-Antivirus-Status: Clean Lines: 14 Message-ID: <4a9bebb6$0$23758$9a566e8b@news.aliant.net> NNTP-Posting-Host: 142.68.106.37 X-Complaints-To: abuse@aliant.net Xref: news.cambrium.nl Marshall wrote: > On Aug 30, 2:44 pm, Bob Badour wrote: > >>No. Both base tables and views are named relation variables. They have >>to be because their values vary over time. > > This is certainly true in the data management viewpoint, but I > could also imagine a relational programming that allowed either > to be unnamed. > > This is admittedly a very obscure point. The unnamed case is just an equation or an expression as in x+y=1