select * from drzewo where haslo = 0 and parent = and widoczne = 1 order by lp, nazwa1;

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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 'and widoczne = 1 order by lp, nazwa1' at line 1

select * from drzewo where haslo = 0 and parent = and widoczne = 1 order by producent asc limit 0,8;

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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 'and widoczne = 1 order by producent asc limit 0,8' at line 1