=> 'SELECT model_id,model_name,model_barcode,model_reserve,model_reserve as item_quantity_to_buy'.
' FROM model'.
' WHERE model_reserve>0 AND NOT EXISTS'.
=> 'SELECT model_id,model_name,model_barcode,model_reserve,model_reserve as item_quantity_to_buy'.
' FROM model'.
' WHERE model_reserve>0 AND NOT EXISTS'.