Which SQL query is better, MATCH AGAINST or LIKE?

Question

To search the database for rows that have both keywords \"foo\" AND \"bar\" in any of the columns \"foo_desc\" and \"bar_desc\", I would do something like:

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Answer 1

Update

As of MySQL 5.6 and later, InnoDB tables supports Match... Against.

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The first is much better. On MyISAM tables it will use a full text index against those columns. The other will do a full table scan doing a concat on every row and then a comparison.

LIKE is only efficient if you're doing it against:

• a column (not a result of a function unless your particular database vendor supports functional indexes--Oracle, for example--and you're using them);
• the start of the column (ie LIKE 'blah%' as opposed to LIKE '%blah%'); and
• a column that's indexed.

If any one of those conditions are not true the only way for the SQL engine to execute the query is by doing a full table scan. This can be usable under about 10-20 thousand rows. Beyond that it quickly becomes unusable however.

Note: One problem with MATCH on MySQL is that it seems to only match against whole words so a search for 'bla' won't match a column with a value of 'blah', but a search for 'bla*' will.