I have a MyISAM table named links. It has a column searcher which has a FULLTEXT index to it.
This is my variable values:
ft_min_word_len = 1
ft_stopword_file =
ft_max_word_len = 84
I need to match the rows which contain both [show] & [1] in any order.
I run this query:
SELECT * FROM links WHERE MATCH(searcher) AGAINST('+[show] +[1]' IN BOOLEAN MODE)
But it is also matching the rows that don't contain [1] string. Whats the problem?
It seems that you have to make clear that the brackets are part of the search string and not part of syntax for grouping expressions.
This query should work for you:
SELECT * FROM links WHERE MATCH(searcher) AGAINST('+"[show]" +"[1]"' IN BOOLEAN MODE)
Here are some sample fiddles:
not working
working
Related
I'm using mysql 5.7 and am having trouble using a wildcard character in a fulltext query.
I want to use the search phase "cleft palate" and have it also include matches for the plural version "cleft palates".
The 2 queries below return the same exact results:
select *
from contents
where match(contents.content) against('+("cleft palate")' in boolean mode)
And
select *
from contents
where match(contents.content) against('+("cleft palate*")' in boolean mode)
Note the wildcard (*)
Both these query are leaving out results for "cleft palates"
Is there a way to use the wildcard character within a phrase in a fulltext query?
i have the following query
SELECT * FROM products
LEFT JOIN product_variations ON products.id=product_variations.productID
WHERE
(
MATCH(products.title, products.metatitle) AGAINST('+ضد*' IN BOOLEAN MODE) > 0 OR
MATCH(product_variations.title, product_variations.metatitle) AGAINST('+ضد*' IN BOOLEAN MODE) > 0
)
why this query doesn't find any result with ضد keyword but find some results with ضع keyword (there is one character difference)
note1: ft_min_word_len = 2
note2: there is enough results in database for both keywords
The problem might be in the character set and collation of your table, see SQL fiddle
Relevance score of MATCH..AGAINST is not working.
Created one dummy table which has 2 rows.
Dummy Table
Row1=> 'Leela Hayat Marriot'
Row2=> 'Americas Best Value'
Query1:
SELECT MATCH (col1) AGAINST ('Leela* Hayat*' IN BOOLEAN MODE) AS relevance
FROM table1
WHERE MATCH (col1) AGAINST ('Leela* Hayat*' IN BOOLEAN MODE);
Result:
relevance
2
Query2:
SELECT MATCH (col1) AGAINST ('Americas* Best*' IN BOOLEAN MODE) AS relevance
FROM table1
WHERE MATCH (col1) AGAINST ('Americas* Best*' IN BOOLEAN MODE);
Result:
relevance
1
Query1 is working fine but why is query 2 not working?
Why am I getting relevance 1 instead of 2 in Query2 as Americas and Best both are present in column.
Thanks
http://dev.mysql.com/doc/refman/5.7/en/fulltext-stopwords.html
'BEST' is listed in stopword list.
http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_ft_stopword_file
ft_stopword_file:
The file from which to read the list of stopwords for full-text searches on MyISAM tables. The server looks for the file in the data directory unless an absolute path name is given to specify a different directory. All the words from the file are used; comments are not honored. By default, a built-in list of stopwords is used (as defined in the storage/myisam/ft_static.c file). Setting this variable to the empty string ('') disables stopword filtering.
I disabled stopwords list and now query 2 is working fine.
Thanks for help.
Table
id name
--- ------
1 chinu
2 sanjib
3 chinmay
My MYSQL Query
SELECT * FROM users WHERE MATCH (name) AGAINST ('chi' IN BOOLEAN MODE)
In above query i am getting 0 record.
My output will be coming
1 chinu
3 chinmay
How to get my actual record using MATCH...AGAINST query?
EDIT - If i am searching chinu instead of chi i am getting 1 record.
You need to add an asterisk to the 'chi' to indicate that the query should match against all that contain the string and not just the string itself. Just using the string 'chi' will only match exactly 'chi' for example.
change your query to read
SELECT * FROM users WHERE MATCH (name) AGAINST ('chi*' IN BOOLEAN MODE)
and you should get the results you expect.
I think you forgot the + sign:
SELECT * FROM users WHERE MATCH (name) AGAINST ('+chi' IN BOOLEAN MODE)
Or if it is an exact phrase, use double quotes to surround the string:
SELECT * FROM users WHERE MATCH (name) AGAINST ('"chi"' IN BOOLEAN MODE)
I am the first to admit that this is not easy to find. MySQL full text search uses a system variable called ft_min_word_length. The default value is 4, as shown here.
Because you are searching for a 3-character word, it is not being indexed. Hence it is not found.
More information is available in the documentation on fine tuning the search. But the basic idea is that you need to change the value of the parameter and rebuild the index.
For your particular query, though, you just need to include wildcards, as explained in other answers.
I am facing difficulty in sorting the result based on field in mysql. Say for example I am searching the word "Terms" then I should get the results which starts with 'Terms' first and then 'Terms and' as next and then 'Terms and conditions' and so on.
Any one please help out who to fetch the search result based on my requirements in efficient manner using mysql query.
SELECT * FROM your_table WHERE your_column LIKE "Terms%" ORDER BY your_column;
Based on the storage engine and mysql version you probably can use the full text search capabilities of MySQL. For example:
SELECT *, MATCH (your_column) AGAINST ('Terms' IN BOOLEAN MODE) AS relevance
FROM your_table
WHERE MATCH (your_column) AGAINST ('Terms' IN BOOLEAN MODE)
ORDER BY relevance
You can find more info here: http://dev.mysql.com/doc/refman/5.5/en/fulltext-boolean.html
Or if you don't want FTS another possible solution where ordering is strictly based on the length (difference) of the strings.
SELECT * FROM your_table WHERE your_column LIKE "Terms%" ORDER BY ABS(LENGTH(your_column) - LENGTH('Terms'));
You are looking for fulltext search. Below a very simple example
SELECT id,name MATCH (name) AGAINST ('string' > 'string*' IN BOOLEAN MODE) AS score
FROM tablename WHERE MATCH (name) AGAINST ('string' > 'string*' IN BOOLEAN MODE)
ORDER BY score DESC
The advantage of this is that you can control the value of words. This is very basic, you can 'up' some matches or words (or 'down' them)
In my example an exact match ('string') would get a higher score than the string with something attached ('string*'). The following line is even one step broader:
'string' > 'string*' > '*string*'
This documentation about fulltextsearch explains allot. It's a long read, but worth it and complete.
Don't use fulltext index if you search for prefix string!
Using LIKE "Term%" the optimizer will be able to use a potential index on your_column:
SELECT * FROM your_table
WHERE your_column LIKE "Terms%"
ORDER BY CHAR_LENGTH(your_column),your_column
Note the ORDER BY clause: it first sorts by string length, and only use alphabetcal order to sort strings of equal length.
And please, use CHAR_LENGTH and not LENGTH as the first count the number of characters, whereas the later count number of bytes. Using a variable length encoding such as utf8, this would made a difference.