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Query with Order By. No index used. why ?

I don't understand

I have this table:
CREATE TABLE product (
p_id int(11) NOT NULL default '0',
p_name varchar(250) NOT NULL default '',
p_cat int(11) NOT NULL default '0',
KEY pp_cat (p_cat),
FULLTEXT KEY p_name (p_name)

With a simple query like that : "SELECT * FROM `product` WHERE
Explain say that the index 'pp_cat' is used

But with a query like "SELECT * FROM `product` ORDER BY p_cat" or
"SELECT * FROM `product` ORDER BY p_id", Explain that no index is
used, but a simple filesort.

However, queries seems pretty fast and I wonder if it's not just a bug
in EXPLAIN, and if in fact index is used...

I'm with mysql 4.0.17

Jul 19 '05 #1
0 968

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