not prevent MySQL from being my favourite cup of database tea :)
Thanx!
George
- èçõîäíî ñúîáùåíèå -
Îò: Sinisa Milivojevic [EMAIL PROTECTED]
Òåìà: Re: Re: distinct / limit optimization
X Gogo writes:
Well, the order in which the queries are made doesn't matter. The query
X Gogo writes:
Hi,
I've been using 3.23.37 source tarball compiled for Linux 2.2.19. Now I
upgraded to 3.23.39 but still the same result... Anyway, it's not that
important - I was just wondering why SELECT DISTINCT ... LIMIT is slower than
the
one without LIMIT. It's not crucial for my
X Gogo writes:
Well, the order in which the queries are made doesn't matter. The query with
LIMIT is always slower than the one
without it. When I used EXPLAIN SELECT... I actually
found that MySQL uses temporary table for the query with
the DISTINCT / LIMIT combination. I presume this
Because it wasn't in system cache yet?
X Gogo wrote:
Hi,
I've tried the folowing query:
SELECT DISTINCT column1 FROM table1 LIMIT 10;
and got the result for 0.23 sec.
Then I've tried the same query without limit:
SELECT DISTINCT column1 FROM table1;
and got the result for 0.01
