MySQL: What is a reverse version of LIKE?

Question

LIKE operator in MySql is used to find rows that contain our query text, for example:

select name from user where name like "%john%" 

which will return John Smith, Peter Johnson etc.

What if I need the opposite - to find rows that are CONTAINED in our query text? For example I give it John Smith and Peter Johnson are best friends and want it to find me all names from the table that could be found in this string.

How to do that?

Answer 1

Here's a way you can achieve what you describe:

SELECT name FROM user  WHERE 'John Smith and Peter Johnson are best friends' LIKE   CONCAT('%', name, '%') 

Answer 2

select name from users where instr('John Smith and Peter Johnson', name) > 0 

I would rather use this method instead of:

select * from users WHERE  'John Smith and Peter Johnson' LIKE CONCAT('%', name ,'%') 

because if there is any chance that the name could contain the % or _ character (eg. name='v%alue') then the above query would still return that record incorrectly. Also note that if your column could contain backslashes and/or "C escape characters" then they would also need to be escaped. This is all explained in MySQL String Comparison Functions. For example the below SQL would return 1:

SELECT 'val\%ue' LIKE CONCAT('%', 'al\\\\\%u' ,'%'); 

The single backslash needed to be escaped with \\\\ and the % character was escaped: \%.