Strange indexing

Hi!

is this OK.

CREATE TABLE test (
id int primary key,
name varchar(255),
parent varchar(32)
);

If i write

explain select * from test where id=1;

This is output of 1st table:
Index Scan using test_pkey on test (cost=0.00..4.82 rows=1 width=183)

but the i create index on parent like this

create index tt on test (parent);

And when i execute query

explain select * from test where parent = '1';

Seq Scan on test (cost=0.00..1.07 rows=1 width=17)

Why i there no index scan if i create index. I also run
vacuum on this table.

both queryes return only 1 row.

--
bye,
Uros mailto:uros(at)sir-mag(dot)com