Newsgroups: fj.lang.misc
Path: galaxy.trc.rwcp.or.jp!coconuts.jaist!wnoc-tyo-news!wnoc-sfc-news!kogwy!math-keio!mad
From: mad@math.keio.ac.jp (MAEDA Atusi)
Subject: Re: [Q]SQL
In-Reply-To: mori@isc.mew.co.jp's message of Wed, 30 Nov 1994 02:38:00 GMT
Message-ID: <MAD.94Dec1192720@diamond.math.keio.ac.jp>
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Organization: Faculty of Sci. and Tech., Keio Univ., Yokohama, Japan.
References: <MORI.94Nov30113800@hvh008.isc.mew.co.jp>
Date: Thu, 1 Dec 1994 10:27:20 GMT
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Xref: galaxy.trc.rwcp.or.jp fj.lang.misc:1440
X-originally-archived-at: http://galaxy.rwcp.or.jp/text/cgi-bin/newsarticle2?ng=fj.lang.misc&nb=1440&hd=a
X-reformat-date: Mon, 18 Oct 2004 15:18:22 +0900
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In article <MORI.94Nov30113800@hvh008.isc.mew.co.jp> mori@isc.mew.co.jp (Shigeki Morimoto) writes:

 >    select count(distinct(A.REGNO)) from A, B, C
 >  where A.REGNO = B.REGNO  or A.REGNO = C.REGNO
 >$B$H$9$k$H(B $BHs>o$K;~4V$,$+$+$C$F$7$^$$$^$9!#(B

$B$G$7$g$&$M!#$3$l$@$H(BB$B$H(BC$B$r7k9g$7$F$$$k$N$K7k9g>r7o$,L5$$$N$G!"D>@Q1i;;(B
$B$K$J$C$F$7$^$$$^$9$+$i!#(B

$BC1$K(B
select REGNO from B union select REGNO from C
$B$G$h$$$N$G$O!#(B

count $B$r<h$C$?$j!"$5$i$K>r7o$r$D$1$F8!:w$7$?$$$J$i%S%e!<$r:n$l$PNI$$$G(B
$B$7$g$&!#Nc$($P!'(B
create view foo(REGNO) as
    select REGNO from B union select REGNO from C;
$B$H$7$F$*$$$F!"(B
select count(REGNO) from foo where REGNO > 100;
$B$H$+!#(B
$BA0ED(B
