Steve Edberg wrote:
> At 11:23 PM +0800 6/30/07, Niu Kun wrote:
>
> To quote from
>
> http://dev.mysql.com/doc/refman/5.0/en/fulltext-search.html
>
>
> "... words that are present in more than 50% of the rows are considered
> common and do not match."
>
> 'hello' appears in both (100%) of your records above, so it will not
> match. You need to insert more test data before MySQL has enough words
> to compute valid relevances.
>
> steve
>
Thank you for your advice.
And again, I've got the following command.
mysql> insert into test values(1,"aaa");
Query OK, 1 row affected (0.00 sec)
mysql> insert into test values(1,"aaa");
Query OK, 1 row affected (0.00 sec)
mysql> insert into test values(1,"aaa");
Query OK, 1 row affected (0.00 sec)
mysql> insert into test values(1,"aaa");
Query OK, 1 row affected (0.00 sec)
mysql> insert into test values(1,"aaa");
Query OK, 1 row affected (0.00 sec)
mysql> select * from test where match(name) against("hello");
Empty set (0.00 sec)
mysql> select * from test where match(name) against("hello" in boolean
mode);
Empty set (0.00 sec)
mysql> select * from test where match(name) against("world" in boolean
mode);
+------+-------------+
| id | name |
+------+-------------+
| 1 | hello world |
+------+-------------+
1 row in set (0.00 sec)
It seems that hello can't be found.
But world can be found.
I wonder if mysql has restrictions on the word to be found.
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