Codice PHP:

$tempo= time();

$queryb = "INSERT INTO "nome tabella" (creation_date) VALUES ('$tempo') where uid="$uid" "; 
errore: 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 'where uid=29d7095aa61752f903f7db39ec785eb6' at line 1

dove sbaglio?