Path: utzoo!utgpu!water!watmath!clyde!bellcore!tness7!killer!osu-cis!tut.cis.ohio-state.edu!cs.utexas.edu!natinst!bigtex!juniper!bloom!bobd From: bobd@bloom.UUCP (Bob Donaldson) Newsgroups: comp.databases Subject: Re: Informix help Summary: Empress/32 can do it Message-ID: <378@bloom.UUCP> Date: 2 Jun 88 15:33:19 GMT References: <1811@pt.cs.cmu.edu> Lines: 23 In article <1811@pt.cs.cmu.edu>, mt1p@VOLGA.EDRC.CMU.EDU (Michael Terk) writes: > of the SELECT statement. The application I am working on requires that I > find an entry in a table that satisfies something like > (bf * (sqrt (tf / d)) >= 1200 and > (d ** tw) / 12000 >= 200 > with the objective function of MIN(d). I need to find out how easialy are > these things done in Informix, so I can either continue working with it, or > switch to another DBMS. Any help will be greatly appreciated. I don't know about Informix, but we have done similar things with Empress/32 (runs under Unix on most anything, under VMS on VAX, under DOS on PC/AT). It requires a little customization, but that is a strength of Empress: it lets you bind in your own C functions and define them to SQL so they can be used in either the select clause or the where clause. VERY helpful for scientific applications!! ---------------------------------------------------------------- Bob Donaldson ...!ut-emx!juniper!radian!bobd Radian Corporation PO Box 201088 (512) 454-4797 Austin, TX 78703 Views expressed are my own, not necessarily those of my employer.