How to find most popular word occurrences in MySQL?

Question

I have a table called results with 5 columns.

I\'d like to use the title column to find rows that are say: WHERE title like \'%for sale%\

Answer 1

You can extract words with some string manipulation. Assuming you have a numbers table and that words are separated by single spaces:

select substring_index(substring_index(r.title, ' ', n.n), ' ', -1) as word,
       count(*)
from results r join
     numbers n
     on n.n <= length(title) - length(replace(title, ' ', '')) + 1
group by word;

If you don't have a numbers table, you can construct one manually using a subquery:

from results r join
     (select 1 as n union all select 2 union all select 3 union all . . .
     ) n
     . . .

The SQL Fiddle (courtesy of @GrzegorzAdamKowalski) is here.