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From: Rajesh Kumar Mallah <mallah@trade-india.com>
To: pgsql-sql@postgresql.org
Subject: sql question regarding count(*)
Date: Thu, 6 Mar 2003 17:02:26 +0530
Message-ID: <200303061702.26339.mallah@trade-india.com> (raw)


When does count(*) returns "o rows" ?
and when does it return 1 row value being 0.

tradein_clients=# SELECT count(*)   from public.eyp_listing  where sno> 0 and 
amount> 0  group by sno,branch,edition having count(distinct userid) > 1 ;
 count
-------
(0 rows)

tradein_clients=#
tradein_clients=#
tradein_clients=# SELECT count(*) from public.users where userid=-1;
 count
-------
     0
(1 row)

tradein_clients=#

-- 

Regds
Mallah

----------------------------------------
Rajesh Kumar Mallah,
Project Manager (Development)
Infocom Network Limited, New Delhi
phone: +91(11)6152172 (221) (L) ,9811255597 (M)

Visit http://www.trade-india.com ,
India's Leading B2B eMarketplace.

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