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From: aaron@grad2.cis.upenn.edu (Aaron Watters)
Newsgroups: comp.databases
Subject: Re: Views (was Re: Database design)
Message-ID: <29147@netnews.upenn.edu>
Date: 4 Sep 90 20:30:29 GMT
References: <1990Aug21.182201.10707@oracle.com> <CIMSHOP!DAVIDM.90Aug23103220@uunet.UU.NET> <1990Aug25.213536.17280@oracle.com> <8753@cognos.UUCP>
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In article <8753@cognos.UUCP> nigelc@cognos.UUCP (Nigel Campbell) writes:
...
>As I responded before there
>are database systems (Starbase,Interbase possibly Rdb/Vms3.1/4.0) which through
>triggers make complex views updateable .

Could someone give an example of how this works?
In particular if view V is the difference between R and S
an `insert' to V could mean either an `insert' to R
or a `delete' to S.  What if you wanted to provide both
interpretations?  What about other such examples?
	Interested, 		-=aaron