Mysql error: Unknown column 'num_sales' in 'order clause'

Error code: 1054

Query: SELECT DISTINCT CatID FROM catalog_models LEFT JOIN shop_orders_models ON shop_orders_models.ModelID = catalog_models.ID WHERE catalog_models.Status != 200 AND (shop_orders_models.ID IS NULL OR TIMESTAMPDIFF(DAY, shop_orders_models.Created, NOW()) <= 30) AND CatID > 0 AND catalog_models.HideIndex = ? GROUP BY catalog_models.ID ORDER BY num_sales DESC

Params:

Array
(
    [0] => 
)

Mysql error: Unknown column 'num_sales' in 'order clause'

Error code: 1054

Query: SELECT DISTINCT CategoryID FROM catalog_models LEFT JOIN shop_orders_models ON shop_orders_models.ModelID = catalog_models.ID INNER JOIN catalog_models_to_cats ON catalog_models_to_cats.ModelID = catalog_models.ID WHERE catalog_models.Status != 200 AND (shop_orders_models.ID IS NULL OR TIMESTAMPDIFF(DAY, shop_orders_models.Created, NOW()) <= 30) AND CategoryID > 0 AND catalog_models.HideIndex = ? GROUP BY catalog_models.ID ORDER BY num_sales DESC

Params:

Array
(
    [0] => 
)

Mysql error: Unknown column 'num_sales' in 'order clause'

Error code: 1054

Query: SELECT DISTINCT TopBrandID FROM catalog_models LEFT JOIN shop_orders_models ON shop_orders_models.ModelID = catalog_models.ID WHERE catalog_models.Status != 200 AND (shop_orders_models.ID IS NULL OR TIMESTAMPDIFF(DAY, shop_orders_models.Created, NOW()) <= 30) AND TopBrandID > 0 AND catalog_models.HideIndex = ? GROUP BY catalog_models.ID ORDER BY num_sales DESC

Params:

Array
(
    [0] => 
)