Question

One named keywords with a keyword column. Another table domains with a column domain. I want to check if any of the keyword in the table keywords appear in domains or not?

How to go about it? I want to do the comparison using like operator. I tried this query

SELECT domain
FROM domains, keywords
WHERE keyword like concat('%',domain,'%')

But I always get empty set. For example I have a keyowrd shop and a domain named ‘www.dailyshop.com’. Now shop is within the said domain. So ‘www.dailyshop.com’ should be shown in query result. Please help

Answer 1

You need to swap the search columns. See Pattern Matching

SELECT domain
FROM domains, keywords
WHERE domain like concat('%',keyword,'%');

e.g.

SELECT 'www.dailyshop.com' LIKE CONCAT('%','shop','%');
+-------------------------------------------------+
| 'www.dailyshop.com' LIKE CONCAT('%','shop','%') |
+-------------------------------------------------+
|                                               1 |
+-------------------------------------------------+