Speedup the dml ??
From: feib <agi_at_feib.com.tw>
Date: Fri, 14 Apr 2000 18:49:47 +0800
Message-ID: <MPG.13617895ac05bf43989683_at_news.gcn.net.tw>
[Quoted] Hello, there
Date: Fri, 14 Apr 2000 18:49:47 +0800
Message-ID: <MPG.13617895ac05bf43989683_at_news.gcn.net.tw>
[Quoted] Hello, there
[Quoted] [Quoted] I have two tables a,b ( a with 600000 records, b 60000 records) [Quoted] Both a and b have the same columns c1 c2 c3 c4 c5. I want to update a's c5 by b's c5 for the same key value c1-c4. So,I create two unique indexies on a(c1,c2,c3,c4) and b(c1,c2,c3,c4).
update a
[Quoted] set c5 = ( select c5 from b where a.c1=b.c1 and a.c2=b.c2 and a.c3=b.c3 and a.c4=b.c4 ); Are there any better statement ( like EXISTS,or any hint to speedup) ?? [Quoted] Any ideas ??
Rgds,
Agi Chen
Received on Fri Apr 14 2000 - 12:49:47 CEST