Mysql: impossible where noticed after reading const tables

Question

i have one query:

SELECT l.id, title 
FROM (SELECT id 
      FROM news 
      WHERE (title LIKE \'%football predictions argentina%\' OR text LIKE \'%football pre         


        

Answer 1

In addition to Shadow's answer, MySQL's explain will show:
Impossible WHERE noticed after reading const tables
when a where condition on a non-indexed field is not matched along with a matched where condition on an indexed field.

It will show
no matching row in const table
when a where condition on an indexed field is not matched.