How to search the multiple keywords in multiple columns? [duplicate] - php

I'm trying to make a search feature that will search multiple columns to find a keyword based match. This query:
SELECT title FROM pages LIKE %$query%;
works only for searching one column, I noticed separating column names with commas results in an error. So is it possible to search multiple columns in mysql?


If it is just for searching then you may be able to use CONCATENATE_WS.
This would allow wild card searching.
There may be performance issues depending on the size of the table.
SELECT *
FROM pages
WHERE CONCAT_WS('', column1, column2, column3) LIKE '%keyword%'


You can use the AND or OR operators, depending on what you want the search to return.
SELECT title FROM pages WHERE my_col LIKE %$param1% AND another_col LIKE %$param2%;
Both clauses have to match for a record to be returned. Alternatively:
SELECT title FROM pages WHERE my_col LIKE %$param1% OR another_col LIKE %$param2%;
If either clause matches then the record will be returned.
For more about what you can do with MySQL SELECT queries, try the documentation.


If your table is MyISAM:
SELECT *
FROM pages
WHERE MATCH(title, content) AGAINST ('keyword' IN BOOLEAN MODE)
This will be much faster if you create a FULLTEXT index on your columns:
CREATE FULLTEXT INDEX fx_pages_title_content ON pages (title, content)
, but will work even without the index.


1)
select *
from employee em
where CONCAT(em.firstname, ' ', em.lastname) like '%parth pa%';
2)
select *
from employee em
where CONCAT_ws('-', em.firstname, em.lastname) like '%parth-pa%';
First is usefull when we have data like : 'firstname lastname'.
e.g
parth patel
parth p
patel parth
Second is usefull when we have data like : 'firstname-lastname'. In it you can also use special characters.
e.g
parth-patel
parth_p
patel#parth


Here is a query which you can use to search for anything in from your database as a search result ,
SELECT * FROM tbl_customer
WHERE CustomerName LIKE '%".$search."%'
OR Address LIKE '%".$search."%'
OR City LIKE '%".$search."%'
OR PostalCode LIKE '%".$search."%'
OR Country LIKE '%".$search."%'
Using this code will help you search in for multiple columns easily


SELECT * FROM persons WHERE (`LastName` LIKE 'r%') OR (`FirstName` LIKE 'a%');
Please try with above query.

Related

FIND_IN_SET with like clause mysql

I have a MySQL table where I am using comma separated values like:
user_name books
abc PHP,Java
xyz Net,Shift,PHP
I can handle comma-separated value searching using the FIND_IN_SET function of MySQL.
Now books names are auto suggested means if any one search with keyword "J" , system should search and match the word Java and give result of user "abc".
I tried to use like clause with FIND_IN_SET but it's not working.
Does anyone have any suggestions?

Not a clean solution but you can use something like this:
SELECT * FROM `library` WHERE `books` LIKE 'J%' OR `books` LIKE '%,J%'

How to select rows from a table where a word appears? (MySQL + PHP)

I have to make a search for keywords as part of my Computer Science work.
I have the names and descriptions of several DVD's.
The user has to search a word, and then displayed are all the names of DVD's where the word appeared in either the title or description.
Let's say my columns in my table
were "dvd title" and "description", and the word the person has entered is $keyword.
How would i select rows in mysql where $keyword appears at least once in either columns "dvd title" and "description".
Thanks for reading. Any help appreciated.

You could create a full text index on those columns, but that probably isn't what they want you do do.
You need wildcards, and to you wildcards compare with the keyword LIKE instead of =. A wildcard in mysql is %
SELECT * FROM mutable WHERE dvdtitle like '%keyword%' or description like '%keyword%';
As for using PHP variable and creating the string, you've got to do some of your own homework.

$sql = "SELECT * FROM table_name WHERE dvdtitle LIKE '%".$keyword."%' OR description LIKE '%".$keyword."%'";
Executing the above SQL query would return all the rows in the table that has the specified keyword in either the column dvdtitle or description.

Use this query:
SELECT *
FROM table_name
WHERE dvd_title like '%$keyword%'
OR description like '%$keyword%'

You can use following code sample, it's not a full code but will give you an idea:
$query_str = "select * from dvd_table_name where dvd_title like '%$keyword%' or description like '%$keyword%'";
$qh = mysql_query($query_str);
Then use mysql_fetch_assoc($qh) to retrive data using while loop;

Select from 3 possible columns, order by occurances / relevance

I have a table that contains 3 text fields, and an ID one.
The table exists solely to get collection of ID's of posts based on relevance of a user search.
Problem is I lack the Einsteinian intellect necessary to warp the SQL continuum to get the desired results -
SELECT `id` FROM `wp_ss_images` WHERE `keywords` LIKE '%cute%' OR `title` LIKE '%cute%' OR `content` LIKE '%cute%'
Is this really enough to get a relevant-to-least-relevant list, or is there a better way?
Minding of course databases could be up to 20k rows, I want to keep it efficient.
Here is an update - I've gone the fulltext route -
EXAMPLE:
SELECT `id` FROM `wp_ss_images` WHERE MATCH (`keywords`,`title`,`content`) AGAINST ('+cute +dog' IN BOOLEAN MODE);
However it seems to be just grabbing all entries with any of the words. How can I refine this to show relevance by occurances?

To get a list of results based on the relevance of the number of occurrences of keywords in each field (meaning cute appears in all three fields first, then in 2 of the fields, etc.), you could do something like this:
SELECT id
FROM (
SELECT id,
(keywords LIKE '%cute%') + (title LIKE '%cute%') + (content LIKE '%cute%') total
FROM wp_ss_images
) t
WHERE total > 0
ORDER BY total DESC
SQL Fiddle Demo

You could concatenate the fields which will be better than searching them individually
SELECT `id` FROM `wp_ss_images` WHERE CONCAT(`keywords`,`title`,`content`) LIKE '%cute%'
This doesn't help with the 'greatest to least' part of your question though.

Comma separated values in MySQL "IN" clause

I have a column in one of my table where I store multiple ids seperated by comma's.
Is there a way in which I can use this column's value in the "IN" clause of a query.
The column(city) has values like 6,7,8,16,21,2
I need to use as
select * from table where e_ID in (Select city from locations where e_Id=?)
I am satisfied with Crozin's answer, but I am open to suggestions, views and options.
Feel free to share your views.

Building on the FIND_IN_SET() example from #Jeremy Smith, you can do it with a join so you don't have to run a subquery.
SELECT * FROM table t
JOIN locations l ON FIND_IN_SET(t.e_ID, l.city) > 0
WHERE l.e_ID = ?
This is known to perform very poorly, since it has to do table-scans, evaluating the FIND_IN_SET() function for every combination of rows in table and locations. It cannot make use of an index, and there's no way to improve it.
I know you said you are trying to make the best of a bad database design, but you must understand just how drastically bad this is.
Explanation: Suppose I were to ask you to look up everyone in a telephone book whose first, middle, or last initial is "J." There's no way the sorted order of the book helps in this case, since you have to scan every single page anyway.
The LIKE solution given by #fthiella has a similar problem with regards to performance. It cannot be indexed.
Also see my answer to Is storing a delimited list in a database column really that bad? for other pitfalls of this way of storing denormalized data.
If you can create a supplementary table to store an index, you can map the locations to each entry in the city list:
CREATE TABLE location2city (
location INT,
city INT,
PRIMARY KEY (location, city)
);
Assuming you have a lookup table for all possible cities (not just those mentioned in the table) you can bear the inefficiency one time to produce the mapping:
INSERT INTO location2city (location, city)
SELECT l.e_ID, c.e_ID FROM cities c JOIN locations l
ON FIND_IN_SET(c.e_ID, l.city) > 0;
Now you can run a much more efficient query to find entries in your table:
SELECT * FROM location2city l
JOIN table t ON t.e_ID = l.city
WHERE l.e_ID = ?;
This can make use of an index. Now you just need to take care that any INSERT/UPDATE/DELETE of rows in locations also inserts the corresponding mapping rows in location2city.

From MySQL's point of view you're not storing multiple ids separated by comma - you're storing a text value, which has the exact same meaing as "Hello World" or "I like cakes!" - i.e. it doesn't have any meaing.
What you have to do is to create a separated table that will link two objects from the database together. Read more about many-to-many or one-to-many (depending on your requirements) relationships in SQL-based databases.

Rather than use IN on your query, use FIND_IN_SET (docs):
SELECT * FROM table
WHERE 0 < FIND_IN_SET(e_ID, (
SELECT city FROM locations WHERE e_ID=?))
The usual caveats about first form normalization apply (the database shouldn't store multiple values in a single column), but if you're stuck with it, then the above statement should help.

This does not use IN clause, but it should do what you need:
Select *
from table
where
CONCAT(',', (Select city from locations where e_Id=?), ',')
LIKE
CONCAT('%,', e_ID, ',%')
but you have to make sure that e_ID does not contain any commas or any jolly character.
e.g.
CONCAT(',', '6,7,8,16,21,2', ',') returns ',6,7,8,16,21,2,'
e_ID=1 --> ',6,7,8,16,21,2,' LIKE '%,1,%' ? FALSE
e_ID=6 --> ',6,7,8,16,21,2,' LIKE '%,6,%' ? TRUE
e_ID=21 --> ',6,7,8,16,21,2,' LIKE '%,21,%' ? TRUE
e_ID=2 --> ',6,7,8,16,21,2,' LIKE '%,2,%' ? TRUE
e_ID=3 --> ',6,7,8,16,21,2,' LIKE '%,3,%' ? FALSE
etc.

Don't know if this is what you want to accomplish. With MySQL there is feature to concatenate values from a group GROUP_CONCAT
You can try something like this:
select * from table where e_ID in (Select GROUP_CONCAT(city SEPARATOR ',') from locations where e_Id=?)

this one in for oracle ..here string concatenation is done by wm_concat
select * from table where e_ID in (Select wm_concat(city) from locations where e_Id=?)
yes i agree with raheel shan .. in order put this "in" clause we need to make that column into row below code one do that job.
select * from table where to_char(e_ID)
in (
select substr(city,instr(city,',',1,rownum)+1,instr(city,',',1,rownum+1)-instr(city,',',1,rownum)-1) from
(
select ','||WM_CONCAT(city)||',' city,length(WM_CONCAT(city))-length(replace(WM_CONCAT(city),','))+1 CNT from locations where e_Id=? ) TST
,ALL_OBJECTS OBJ where TST.CNT>=rownum
) ;

you should use
FIND_IN_SET Returns position of value in string of comma-separated values
mysql> SELECT FIND_IN_SET('b','a,b,c,d');
-> 2

You need to "SPLIT" the city column values. It will be like:
SELECT *
FROM table
WHERE e_ID IN (SELECT TO_NUMBER(
SPLIT_STR(city /*string*/
, ',' /*delimiter*/
, 1 /*start_position*/
)
)
FROM locations);
You can read more about the MySQL split_str function here: http://blog.fedecarg.com/2009/02/22/mysql-split-string-function/
Also, I have used the TO_NUMBER function of Oracle here. Please replace it with a proper MySQL function.

IN takes rows so taking comma seperated column for search will not do what you want but if you provide data like this ('1','2','3') this will work but you can not save data like this in your field whatever you insert in the column it will take the whole thing as a string.

You can create a prepared statement dynamically like this
set #sql = concat('select * from city where city_id in (',
(select cities from location where location_id = 3),
')');
prepare in_stmt from #sql;
execute in_stmt;
deallocate prepare in_stmt;

Ref: Use a comma-separated string in an IN () in MySQL
Recently I faced the same problem and this is how I resolved it.
It worked for me, hope this is what you were looking for.
select * from table_name t where (select (CONCAT(',',(Select city from locations l where l.e_Id=?),',')) as city_string) LIKE CONCAT('%,',t.e_ID,',%');
Example: It will look like this
select * from table_name t where ',6,7,8,16,21,2,' LIKE '%,2,%';

How to make search engine query in Mysql&PHP?

I want to make a search engine in an intranet. Now i use this clause in PHP.
$k = explode(" ",$_GET[key]);
$sql = "select entreprise.*, employee.* where entreprise.* or employee.* like '%$k[0]%' or '%$k[1]%'";
But it seems doesn't work. Do you know where is wrong?
Thanks in advance.
Edit:
$sql = "select * from entreprise, site, salarie where entreprise.*, site.*, salarie.* like '%$k[0]%' or '%$k[1]%'";
I have modified the query clause. With this code, i think you can know what i want to do.
I want to find anything that matches the content in all the columns of entreprise table and the content in all the columns of employee table.

It's hard to exactly see what you're trying to do, but you need, in your SQL query, to specify :
on which tables you are working, with a from clause
on which fields the search has to be done, in the where clause.
how the data between employees and enterprises are related :
do you want to search for entreprises and their employees ?
for employees and there enterprises ?
for all enterprises and the employees when the employee or the enterprise contains the words ?
You could use something like this to search for entreprises that contain the word, and get their employees to :
select *
from entreprise
inner join employee on employee.id_entreprise = entreprise.id
where entreprise.name like '%word%'
or entreprise.description like '%word%';
Or, to search for employees that match the criteria and get their entreprise too :
select *
from employee
inner join entreprise on entreprise.id = employee.id_entreprise
where employee.name like '%word%';
(just some ideas -- you'll have to build from there !)

This:
$sql = "select entreprise.*, employee.* where entreprise.* or employee.* like '%$k[0]%' or '%$k[1]%'";
is not valid SQL. It is hard to guess what you want to do, but I'm trying anyway: you want to find employees, and search them by name or by enterprise that employs them. Is that the case? Or do you want to search employess and/or enterprises?
EDIT
I want to find anything that matches the content in all the columns of entreprise table and the content in all the columns of employee table.
Ok, first of all you should realize that SQL is probably not the best tool for this job. See the other commenter - his suggestions about sphinx and friends are good. But still, if you really want to:
$sql = '
SELECT e.id, e.name
FROM enterprise e
-- first, look in column1
WHERE e.column1 LIKE '."'%".$k[0]."%'".'
OR e.column1 LIKE '."'%".$k[1]."%'".'
...etc for all entries in k...
OR e.column1 LIKE '."'%".$k[N]."%'".'
-- then, look in column2
OR e.column2 LIKE '."'%".$k[0]."%'".'
OR e.column2 LIKE '."'%".$k[1]."%'".'
...and so on and so forth for all entries in $k and all columns in enterprise...
UNION ALL
SELECT s.id, s.name
FROM salarie s
WHERE ...and the same for columns of salarie...
...
UNION ALL
...any other tables you want to search...
';
As you can see, not something that makes you happy.
Another approach that might give you more joy is having some overnight job to scan all rows in the tables you're interested in, parse the texts you want to search into separate words, and store those in a keyword table, and storing the association between an object from the source database and the keyword in a separate table. You can then search the keyword table and use the id's and table names you find for a collection of keywords to build the actual query to retrieve those rows. This is what I do, and it works great. It works better because there is a relatively small amount of words that you will encounter, whereas the collection of objects is quite possible very large.

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