我可以在MySql查询中使用总计小计吗？

Question

所以我有一个查询，将计数细分为2列。查询如下：

SELECT `Location`, `Model Name`, Count
FROM (
    SELECT IF(`Location` = @Prev, NULL, `Location`) AS 'Location',
           `Model Name`, 
           Count, 
           @Prev := `Location`
    FROM (SELECT `locations`.`location_name` AS 'Location', 
             `inventory`.`equip_model` AS 'Model Name', 
             count(`inventory`.`equip_model`) AS 'Count' 
          FROM mod_inventory_data AS `inventory` 
          LEFT JOIN mod_locations_rooms AS `rooms` ON `rooms`.room_id = `inventory`.room_id 
          WHERE inventory.equip_model LIKE '%optiplex%'  
          GROUP BY `Location`, `Model Name`) AS subq
    CROSS JOIN (SELECT @Prev := NULL) AS init
    ) AS subq2

上面的查询将产生如下输出：

location 1   optiplex 745   24
             optiplex 755   18
             optiplex 780   30
location 2   optiplex 745   15
             optiplex 755   22
             optiplex 780   25

有没有办法修改它给我这样的东西：

location 1   optiplex 745   24
             optiplex 755   18
             optiplex 780   30
                   TOTAL:   72

location 2   optiplex 745   15
             optiplex 755   22
             optiplex 780   25
                   TOTAL:   62

             GRAND TOTAL:  134

非常感谢任何帮助。

Dan B。