Rép. : What does count(*) count?

From: "Erwan DUROSELLE" <EDuroselle(at)seafrance(dot)fr>
To: <pgsql-general(at)postgresql(dot)org>, <csegyud(at)vnet(dot)hu>
Subject: Rép. : What does count(*) count?
Date: 2003-12-31 10:53:36
Message-ID: 7fddccc22d7f90ed628e61d91373f8fb3ff2aa6e@
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4908*2=9816
2 inserts on the same line in the dmp file?

Erwan

>>> Együd Csaba <csegyud(at)vnet(dot)hu> 31/12/2003 09:58:25 >>>
Hi all,
I tried to dump out a single table and just for a verification I counted the
number of 'INERT INTO' rows.
I found that count(*) results less rows than grep.
*******************

Csaba(at)compaq ~
$ pg_dump -d -t t_stockchanges alumil6 > sc.dump

*******************

alumil6=# select count(*) from t_stockchanges ;
count
-------
9816
(1 row)

*******************

Csaba(at)compaq ~
$ cat sc.dump | grep 'INSERT INTO' | wc -l
4908

*******************
What can be the reason of it?

Thx,

-- Csaba

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match

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