[PHP] what problem in this sql

[Alawi]

  SELECT type_id, type_name, cont_id, type_id, cont_title, cat_id, cat_name
  FROM cont_data, cont_cats, cont_types
  WHERE contdata.cont_id = $cont_id
  AND cont_data.type_id = cont_types.type_id
  AND cont_data.cat_id = cont_cats.cat_id


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