Stupid database use the index!

From: Greg Maxwell <gmaxwell(at)martin(dot)fl(dot)us>
To: pgsql-general(at)postgresql(dot)org
Subject: Stupid database use the index!
Date: 2000-08-22 14:01:30
Message-ID: Pine.GSO.3.96.1000822095930.24158E-100000@da1server
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Postgres 7.0.2 on linux.

Why is this?

web=# explain select account_nbr from apprsl_accounts where account_nbr =
3315;
NOTICE: QUERY PLAN:

Seq Scan on apprsl_accounts (cost=0.00..10317.24 rows=1 width=8)

EXPLAIN
web=# explain select account_nbr from apprsl_accounts where account_nbr =
'3315';
NOTICE: QUERY PLAN:

Index Scan using apprsl_accounts_account_nbr on apprsl_accounts
(cost=0.00..4.80 rows=1 width=8)

EXPLAIN

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