Hi!
On May 22, Victoria Reznichenko wrote:
> Przemyslaw,
> Wednesday, May 22, 2002, 2:02:52 AM, you wrote:
>
> PP> SELECT ISBN,TITLE FROM tBooks
> PP> WHERE tBooks.ISBN="1876340436"
> PP> AND MATCH (tBooks.TITLE) AGAINST ("britannica")
>
> PP> +------------+-----------------------------+
> PP> | ISBN | TITLE |
> PP> +------------+-----------------------------+
> PP> | 1876340436 | 2000 Lonely Planet Calendar |
> PP> +------------+-----------------------------+
> PP> 1 row in set (0.00 sec)
>
> PP> Why is it so? I suspected to get an empty result set.
> PP> MYSQL Ver 11.16 Distrib 3.23.49, for Win95/Win98 (i32)
It looks like a bug. Can you create a test case for this ?
> MATCH() returnes you relevance value. So, it is always true in
> WHERE clause. As a result you get result where ISBN=1876340436. In
> your case you can re-write you query:
>
> SELECT ISBN,TITLE, MATCH (tBooks.TITLE) AGAINST ("britannica")
> as aa FROM tBooks
> WHERE tBooks.ISBN="1876340436"
> HAVING aa>0;
Relevance value of 0 is treated as false. Adding HAVING should not
really help. It even makes the query slower, as MySQL cannot use
fulltext index to resolve the query.
Regards,
Sergei
--
MySQL Development Team
__ ___ ___ ____ __
/ |/ /_ __/ __/ __ \/ / Sergei Golubchik <[EMAIL PROTECTED]>
/ /|_/ / // /\ \/ /_/ / /__ MySQL AB, http://www.mysql.com/
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