My SQL Errors Debug..

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MySQL Error : 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 N_postParent = 0 and N_Class =' at line 1
Query Result : select * from guchen_recipe where N_YN = 1 and N_Key != and N_postParent = 0 and N_Class =