SQL Query where a field value does not contain empty spaces

Question

I am currently using the follow query:

SELECT *
FROM `wp_usermeta`
WHERE meta_key='avatar'
AND meta_key NOT LIKE '% '
ORDER BY RAND()
LIMIT 4

In that way, I want to try to get only field values, where no empty spaces re in the file name. Where is the error in my query? It still selects filenames with empty spaces in the filename.

Answer 1

Try

NOT LIKE '% %'

Your current wildcard match only catches trailing spaces.

Also, you're using meta_key twice. Should the column used in your LIKE clause be meta_value (or whatever it is in Wordpress).

This question is probably worth reading if you're concerned about performance - Which is faster — INSTR or LIKE?