I have a table in a database with records containing keywords as well as other data. What would be a logical way to create a search function that would allow people to search based on keywords, and order results based on the number of matched keywords?
Mysql provide FULLTEXT search options. Check this link mysql full text search. These search results will be sorted according to best match. it also has support for boolean mode and NATURAL LANGUAGE MODE(default). You need to add FULLTEXT index on search column.
Here is the query that will work for you.
SELECT *, MATCH (ab,cd) AGAINST ('sample text' IN BOOLEAN MODE) AS relevancy
FROM table_name
WHERE MATCH (ab,cd) AGAINST ('sample text' IN BOOLEAN MODE)
ORDER BY relevancy DESC;
Related
I have already searched online but not find any use full link Fulltext search only returns exact matches
I have column posttitle with row values
shiva
goodshiva
goodshiva
goodshivagood
Query:
SELECT * FROM `jobs` WHERE match(posttitle) against('shiva' in boolean mode)
and
SELECT * FROM `jobs` WHERE match(posttitle) against('*shiva*' in boolean mode)
doesn't return any value
SELECT * FROM `jobs` WHERE match(posttitle) against('shiva*' in boolean mode)
and
SELECT * FROM `jobs` WHERE match(posttitle) against('+shiva*' in boolean mode)
shows only shivagood and shiva
using natural language mode shows only exact match.
Is there any way without using like?
You have found a limitation to mysql full text search.
There is no equivalent syntax to
LIKE '%something%'
While MySQL itself will return a result for that type of query, no index can be used, so the table involved will be "table scanned"
The full text match syntax of +shiva* will only match when a word starts with shiva. It will not match for words that contain shiva but do not start with shiva.
*shiva*
Is not supported.
Due to this limitation and other issues with full text search, many websites utilize an external search engine like sphinx or solr. Sphinx for example, does allow for
'*shiva*'.
I want to make a search tool for my website.
if i search for a phrase i want it to search multiple columns
for example if i search dewalt drill and the title has the works dewalt power drill i want it to come up.
also if i search dewalt drill and the tile has dewalt and the description has drill i want it to come up.
but all words of the search must be contained in any combination of fields.
can someone help me with the query?
Currently:
{Select * from products where sku like '%{$searchwords}%' or title like '%{$searchwords}%' or desc like '%{$searchwords}%}
If your table is myisam you can create a fulltext index then use in boolean mode
to add the key:
alter table products ADD FULLTEXT (sku, title, desc)
then your query would be:
$searchwords = join(' +', explode(' ', $searchwords));
$query = "SELECT * FROM products WHERE MATCH (sku, title, desc) AGAINST ('{$searchwords}' IN BOOLEAN MODE)";
Your probably want FULLTEXT searching (starting with MySQL 5.6, this is also available for InnoDB tables). You can require all words with BOOLEAN MODE.
Why does this SQL query return a blank result?
select
webs.title,webs.disc,webs.logo,webs.id
from
webs
JOIN rel ON rel.webid=webs.id
JOIN catagory on catagory.id=rel.catid
where
webs.app!=0
AND MATCH (webs.title,webs.city,webs.state,webs.url,catagory.catname) AGAINST ('+".$_GET['search']."' IN BOOLEAN MODE)
This is a query for multiples searches in multiple tables and fields.
I also want to order the result by the best matching word.
If you want to use "MATCH() ... AGAINST", first create fulltext index on the field which you want in match.
I have the following query which is used in order to do an auto-complete of a search box:
SELECT *, MATCH (screen_name, name) AGAINST ('+query*' IN BOOLEAN MODE) AS SCORE
FROM users
WHERE MATCH (screen_name, name) AGAINST ('+query*' IN BOOLEAN MODE)
ORDER BY SCORE DESC LIMIT 3
I also have a FULL TEXT index on screen_name & name (together). When this table was relatively small (50k) this worked great. Now the table is ~200k and it takes seconds(!) to complete each query. I'm using MySql MyISAM. Is this reasonable? What directions might I check in order to improve this as surely it doesn't satisfy the needs of an auto-complete query.
MYSQL Match against is really slow, you should look into alternatives like Sphinx Search Server.
I'm trying to get fulltext searches to be sorted by relevance in a
Doctrine_RawSql query.
This code will perform the search:
$q = new Doctrine_RawSql();
$q->select('{p.*}')
->from('cms_page p')
->where('match(p.content) against (?)', $user_query)
->addComponent('p', 'CmsPage p');
This will execute. I would like the results to be sorted by relevance
The real sql would have to look something like:
select
p.id,
match(p.content) against (?) as score
from
cms_page as p
order by
score desc;
So I need to get that match ... against clause in the select... I think.
My crapshoot guess at accomplishing this was:
$q->select("{p.id}, match({p.content}) against ('$escaped_user_query') as score")
->from('cms_page p')
->orderBy('score DESC')
->addComponent('p', 'CmsPage p');
That doesn't work. Any pointers?
Thanks in advance!
According to the MySQL fulltext natural language search docs:
When MATCH() is used in a WHERE clause, as in the example shown earlier, the rows returned are automatically sorted with the highest relevance first. Relevance values are nonnegative floating-point numbers. Zero relevance means no similarity. Relevance is computed based on the number of words in the row, the number of unique words in that row, the total number of words in the collection, and the number of documents (rows) that contain a particular word.
Does this not work for you?
You can read more about natural fulltext search in MySQL here.