<b>MySQL server error report:Array
(
    [0] => Array
        (
            [message] => MySQL Query Error
        )

    [1] => Array
        (
            [sql] => select count(1) as num,gtype as nature,cat_name from ecs_types,  ecs_goods where is_on_sale=1 and is_delete=0    and cat_id  in (6) and ecs_goods.gtype=ecs_types.cat_id group by gtype
        )

    [2] => Array
        (
            [error] => Column 'cat_id' in where clause is ambiguous
        )

    [3] => Array
        (
            [errno] => 1052
        )

)