Đoàn tự do với đoàn mysql select query

Question

(SELECT COUNT(motorbike.`owner_id`) as count,owner.`name`,transport.`type` FROM transport,owner,motorbike WHERE transport.type='motobike' 
AND owner.`owner_id`=motorbike.`owner_id` 
AND transport.`type_id`=motorbike.`motorbike_id` GROUP BY motorbike.owner_id) 
UNION ALL 
(SELECT COUNT(car.`owner_id`) as count,owner.`name`,transport.`type` FROM transport,owner,car WHERE transport.type='car' 
AND owner.`owner_id`=car.`owner_id` 
AND transport.`type_id`=car.`car_id` GROUP BY car.`owner_id`) 

Truy vấn trên trả về kết quả là như thế này dưới đây,

count   name 
1    Linda 
2    Mary 
1    Steve 
1    Linda 

Truy vấn này là để đếm có bao nhiêu phương tiện giao thông mà thuộc sở hữu của một chủ sở hữu. Linda có một chiếc xe và một chiếc xe máy, vì vậy kết quả nên:

count   name 
2    Linda 
2    Mary 
1    Steve 

Tôi đã thử truy vấn này, nhưng trả về lỗi:

(SELECT COUNT(motorbike.`owner_id`),owner.`name`,transport.`type` FROM transport,owner,motorbike WHERE transport.type='motobike' 
AND owner.`owner_id`=motorbike.`owner_id` 
AND transport.`type_id`=motorbike.`motorbike_id`) 
UNION ALL 
(SELECT COUNT(car.`owner_id`),owner.`name`,transport.`type` FROM transport,owner,car WHERE transport.type='car' 
AND owner.`owner_id`=car.`owner_id` 
AND transport.`type_id`=car.`car_id`) GROUP BY motorbike.owner_id 

thể bất cứ ai giúp tôi xin vui lòng?

Answer 1

select sum(qty), name 
from (
    select count(m.owner_id) as qty, o.name 
    from transport t,owner o,motorbike m 
    where t.type='motobike' and o.owner_id=m.owner_id 
     and t.type_id=m.motorbike_id 
    group by m.owner_id 

    union all 

    select count(c.owner_id) as qty, o.name, 
    from transport t,owner o,car c 
    where t.type='car' and o.owner_id=c.owner_id and t.type_id=c.car_id 
    group by c.owner_id 
) t 
group by name 

Answer 2

Hãy thử EDITED này:

(SELECT COUNT(motorbike.owner_id),owner.name,transport.type FROM transport,owner,motorbike WHERE transport.type='motobike' AND owner.owner_id=motorbike.owner_id AND transport.type_id=motorbike.motorbike_id GROUP BY motorbike.owner_id) 

UNION ALL 

(SELECT COUNT(car.owner_id),owner.name,transport.type FROM transport,owner,car WHERE transport.type='car' AND owner.owner_id=car.owner_id AND transport.type_id=car.car_id GROUP BY car.owner_id) 

Answer 3

Đây có thể là những gì sau của bạn:

SELECT Count(Owner_ID), Name 
FROM (
    SELECT M.Owner_ID, O.Name, T.Type 
    FROM Transport As T, Owner As O, Motorbike As M 
    WHERE T.Type = 'Motorbike' 
    AND O.Owner_ID = M.Owner_ID 
    AND T.Type_ID = M.Motorbike_ID 

    UNION ALL 

    SELECT C.Owner_ID, O.Name, T.Type 
    FROM Transport As T, Owner As O, Car As C 
    WHERE T.Type = 'Car' 
    AND O.Owner_ID = C.Owner_ID 
    AND T.Type_ID = C.Car_ID 
) 
GROUP BY Owner_ID