SQL：複数のテーブルからの選択

Question

私は10個のテーブルを親キーで通信しています。私が必要とするすべての情報を引き出そうとしています。

これは私が今使っているクエリです：

SELECT a.date_in, a.date_out, b.name, b.phone, b.birthdate, 
b.country, b.hotel, b.room_nr, b.passport_nr, c.email, 
d.size, e.name, GROUP_CONCAT(g.service), GROUP_CONCAT(h.service) 
, GROUP_CONCAT(i.time), GROUP_CONCAT(j.location) 
FROM reservation a, rider b, user c, 
bike_size d, bike e, services_reservation f, services g, 
bike_shipping h, bike_shipping_reservation i 
, bike_shipping_location j WHERE a.rider_id = b.id 
AND b.user_id = c.id AND a.bike_size_id = d.id AND 
d.bike_id = e.id AND a.id = f.reservation_id AND 
f.services_id = g.id 
AND h.id = i.bike_shipping_id AND a.id = i.reservation_id 
AND i.bike_shipping_location_id = j.id 
AND a.id = 80 

問題は、私はGROUP_CONCAT機能を使用するすべての列が、何回も重複してしまうことがあります。たとえば：

GROUP_CONCAT(g.service) column 
Road SPD,Road SPD,Bike Helmet,Bike Helmet,TT Bar,TT Bar,Garmin Edge 
810,Garmin Edge 810 

は、私はそれを修正することができますどのように

Road SPD,Bike Helmet,TT Bar,Garmin Edge 810 

任意のアイデアすべきですか？私のデータベーススキームは良いですか？

SQLFiddle： http://sqlfiddle.com/#!9/8bc033/33

Answer 1

あなたGROUP_CONCAT文でDISTINCTを使用する

SELECT a.date_in, a.date_out, b.name, b.phone, b.birthdate, 
b.country, b.hotel, b.room_nr, b.passport_nr, c.email, 
d.size, e.name, GROUP_CONCAT(DISTINCT g.service), GROUP_CONCAT(DISTINCT h.service) 
, GROUP_CONCAT(DISTINCT i.time), GROUP_CONCAT(DISTINCT j.location) 
FROM reservation a, rider b, user c, 
bike_size d, bike e, services_reservation f, services g, 
bike_shipping h, bike_shipping_reservation i 
, bike_shipping_location j WHERE a.rider_id = b.id 
AND b.user_id = c.id AND a.bike_size_id = d.id AND 
d.bike_id = e.id AND a.id = f.reservation_id AND 
f.services_id = g.id 
AND h.id = i.bike_shipping_id AND a.id = i.reservation_id 
AND i.bike_shipping_location_id = j.id 
AND a.id = 80 

Answer 2

GROUP_CONCAT

、IN DISTINCT

SELECT a.date_in, a.date_out, b.name, b.phone, b.birthdate, 
b.country, b.hotel, b.room_nr, b.passport_nr, c.email, 
d.size, e.name, GROUP_CONCAT(DISTINCT g.service), GROUP_CONCAT(DISTINCT h.service) 
, GROUP_CONCAT(DISTINCT i.time), GROUP_CONCAT(DISTINCT j.location) 
FROM reservation a, rider b, user c, 
bike_size d, bike e, services_reservation f, services g, 
bike_shipping h, bike_shipping_reservation i 
, bike_shipping_location j WHERE a.rider_id = b.id 
AND b.user_id = c.id AND a.bike_size_id = d.id AND 
d.bike_id = e.id AND a.id = f.reservation_id AND 
f.services_id = g.id 
AND h.id = i.bike_shipping_id AND a.id = i.reservation_id 
AND i.bike_shipping_location_id = j.id 
AND a.id = 80