SQL: SELECT von mehreren Tabellen

Question

Ich habe 10 Tabellen, die zwischen ihnen mit Elternschlüsseln kommunizieren und ich versuche, alle Informationen herauszuziehen, die ich brauche.

Dies ist die Abfrage, die ich jetzt bin mit:

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 

Das Problem ist, dass alle Spalten, in denen ich GROUP_CONCAT Funktion zu verwenden, oft dupliziert bekommen. Zum Beispiel:

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

sollte

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

Irgendwelche Ideen sein, wie ich es beheben kann? ist mein Datenbankschema gut?

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

Answer 1

Verwenden DISTINCT in Ihrem GROUP_CONCAT Aussagen

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

Try this DISTINCT IN GROUP_CONCAT

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