Is the plus query return more then 50% of the records? If so, MySQL
won't return anything since the result set isn't that relevant.
Brent Baisley
Systems Architect
On Apr 11, 2008, at 8:08 AM, Barry wrote:
I am confused ( nothing new there), what I thought was a simple
search is proving not to be so,
Can anyone tell me why this query for the word 'plus':
mysql> SELECT *
-> FROM booktitles
-> WHERE MATCH (category , publisher , bookTitle , author)
-> AGAINST (CONVERT( _utf8'plus'USING latin1 )
-> IN BOOLEAN MODE)
-> ORDER BY category;
Empty set (0.00 sec)
returns an empty result set, when this query:
mysql> SELECT *
-> FROM `booklist`.`booktitles`
-> WHERE `id` LIKE '%plus%'
-> OR `category` LIKE CONVERT( _utf8 '%plus%'
-> USING latin1 )
-> COLLATE latin1_swedish_ci
-> OR `publisher` LIKE CONVERT( _utf8 '%plus%'
-> USING latin1 )
-> COLLATE latin1_swedish_ci
-> OR `bookTitle` LIKE CONVERT( _utf8 '%plus%'
-> USING latin1 )
-> COLLATE latin1_swedish_ci
-> OR `author` LIKE CONVERT( _utf8 '%plus%'
-> USING latin1 )
-> COLLATE latin1_swedish_ci
-> OR `publishDate` LIKE '%plus%';
+-----+----------+---------------
+
---------------------------------------------------------------------------+
-------------------------------------+-------------+
| id | category | publisher | bookTitle | author | publishDate |
+-----+----------+---------------
+
---------------------------------------------------------------------------+
-------------------------------------+-------------+
| 39 | C++ | SAMS | C++ Primer Plus Fourth Edition | Stephen Prata |
2001 |
| 162 | Linux | Wiley | Ubuntu Linux Toolbox 1000 plus Commands for
Ubuntu and Debian Power Users | Christopher Negus Fran�ois Caen |
2007 |
| 496 | C++ | Prentice Hall | C Plus Plus GUI Programming With Qt 4
2nd Edition | Jasmin Blanchette, Mark Summerfield | 2008 |
+-----+----------+---------------
+
---------------------------------------------------------------------------+
-------------------------------------+-------------+
3 rows in set (0.00 sec)
provides the correct answer?
Thinking that it the first query wasn't picking up a four letter
term, I ran this search for the word 'real'
mysql> SELECT *
-> FROM booktitles
-> WHERE MATCH (category , publisher , bookTitle , author)
-> AGAINST (CONVERT( _utf8'real'USING latin1 )
-> IN BOOLEAN MODE)
-> ORDER BY category;
+-----+----------+---------------
+---------------------------------------------------------
+----------------------+-------------+
| id | category | publisher | bookTitle | author | publishDate |
+-----+----------+---------------
+---------------------------------------------------------
+----------------------+-------------+
| 134 | Linux | Prentice Hall | Embedded Linux Primer: A Practical,
Real-World Approach | Christopher Hallinan | 2006 |
+-----+----------+---------------
+---------------------------------------------------------
+----------------------+-------------+
1 row in set (0.00 sec)
and as you can see it came up with the correct result.
Thanks for looking
Barry
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