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 '' at line 1
SELECT idiomas_id FROM unidades WHERE unidades_id =

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 idiomas_id = ORDER BY sequencia' at line 4
SELECT nome,unidades_id FROM unidades WHERE unidades_id <> AND idiomas_id = ORDER BY sequencia

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 '' at line 1
SELECT idiomas_id FROM unidades WHERE unidades_id =

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 '' at line 1
SELECT referencia FROM unidades WHERE unidades_id =

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 u.referencia =' at line 6
SELECT u.unidades_id, i.nome, i.imagen from unidades u, idiomas i where u.idiomas_id=i.idiomas_id and i.ativo = 1 and i.idiomas_id <> and u.referencia =

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 '' at line 1
SELECT idiomas_id FROM unidades WHERE unidades_id =
    ok!