A PHP Error was encountered

Severity: Notice

Message: Undefined index: id

Filename: controllers/caminosdelvino_categorias.php

Line Number: 9

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY `titulo`' at line 4

SELECT * FROM (`caminosdelvino_empresas`) WHERE `caminosdelvino_categoria_id` = ORDER BY `titulo`