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understand. but my difficulty is that I can not modify tables bdd.
Regards

Thanks all, but I can not change the structure of the database,

the only thing you can do is :
$id is variable from PHP

SELECT DISTINCT id, description from products
where (id_cat = "$id" or...

Hi need help,
table category
id int
description varchar

table products
id int
id_cat varchar
etc..