i have a table in following format:
id | title
---+----------------------------
1 | php jobs, usa
3 | usa, php, jobs
4 | ca, mysql developer
5 | developer
i want to get the most popular keywords in title field, please guide.
SELECT title 1, COUNT(*) FROM table GROUP BY title 1
EDIT
Since you've edited and presented a non-normalized table, I would recommend you normalize it.
Have a read of: http://blog.fedecarg.com/2009/02/22/mysql-split-string-function/
If you have a list of keywords, you can do the following:
select kw.keyword, count(*)
from t cross join
keywords kw
on concat(', ', t.title, ',') like concat(', ', kw.keyword, ',')
As others have mentioned, though, you have a non-relational database design. The keywords in the title should be stored in separate rows, rather than as a comma separated list.
If your data is small (a few hundred thousand rows or less), you can put it into Excel, use the text-to-columns function, rearrange the keywords, and create a new, better table in the database.
You need to modify your database. You should have something like this:
items
+----+---------------+
| id | title |
+----+---------------+
| 1 | something |
| 3 | another thing |
| 4 | yet another |
| 5 | one last one |
+----+---------------+
keywords
+----+-----------------+
| id | keyword |
+----+-----------------+
| 1 | php jobs |
| 2 | usa |
| 3 | php |
| 4 | jobs |
| 5 | ca |
| 6 | mysql developer |
| 7 | developer |
+----+-----------------+
items_to_keywords
+---------+------------+
| item_id | keyword_id |
+---------+------------+
| 1 | 1 |
| 1 | 2 |
| 3 | 2 |
| 3 | 3 |
| 3 | 4 |
| 4 | 5 |
| 4 | 6 |
| 5 | 7 |
+---------+------------+
Do you see the advantage? The ability to make relations is what you should be leveraging here.