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 use ExtractValue in some interesting way. See SQL fiddle here: http://sqlfiddle.com/#!9/0b0a0/45

We need only one table:

CREATE TABLE text (`title` varchar(29));

INSERT INTO text (`title`)
VALUES
    ('cheap cars for sale'),
    ('house for sale'),
    ('cats and dogs for sale'),
    ('iphones and androids for sale'),
    ('cheap phones for sale'),
    ('house furniture for sale')
;

Now we construct series of selects which extract whole words from text converted to XML. Each select extracts N-th word from the text.

select words.word, count(*) as `count` from
(select ExtractValue(CONCAT('', REPLACE(title, ' ', ''), ''), '//w[1]') as word from `text`
union all
select ExtractValue(CONCAT('', REPLACE(title, ' ', ''), ''), '//w[2]') from `text`
union all
select ExtractValue(CONCAT('', REPLACE(title, ' ', ''), ''), '//w[3]') from `text`
union all
select ExtractValue(CONCAT('', REPLACE(title, ' ', ''), ''), '//w[4]') from `text`
union all
select ExtractValue(CONCAT('', REPLACE(title, ' ', ''), ''), '//w[5]') from `text`) as words
where length(words.word) > 0
group by words.word
order by `count` desc, words.word asc