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我正在使用Rennes的数据（该页面的第二个 zip 文件）和这个表模式。

这是我的第一个查询，它列出了一条路线的停靠点（从该路线的第一次旅行开始）：

select
        first_trip_of_route.trip_id,
        st.stop_id,
        s.stop_name         
from (
    select
        t.trip_id,
        r.route_long_name
    from routes r
    left join trips t on t.route_id = r.route_id
    where r.route_id = '0033'
    limit 1
    ) as first_trip_of_route
left join stop_times st on st.trip_id = first_trip_of_route.trip_id
left join stops s on s.stop_id = st.stop_id
order by st.stop_sequence;

它有效，这里是雷恩 33 路公交车的站点：

+---------+---------+----------------------+
| trip_id | stop_id | stop_name            |
+---------+---------+----------------------+
| 2420    | 2220    | Gautrais             |
| 2420    | 2221    | Rossel               |
| 2420    | 2234    | Pommerais            |
| 2420    | 2223    | Abbé Grimault        |
| 2420    | 2232    | Morinais             |
| 2420    | 2202    | Collège Jean Moulin  |
| 2420    | 2214    | Médiathèque          |
| 2420    | 2204    | Jean Marin           |
| 2420    | 2263    | Jean Jaurès          |
| 2420    | 2205    | Blosne               |
| 2420    | 2225    | Gaité                |
| 2420    | 2230    | Rablais Allende      |
| 2420    | 2227    | Croix Verte          |
| 2420    | 2271    | 25 Fusillés          |
| 2420    | 1454    | Bréquigny Piscine    |
| 2420    | 1455    | Lycée Bréquigny      |
| 2420    | 1456    | Coubertin            |
| 2420    | 1457    | Norvège              |
| 2420    | 1130    | Canada               |
| 2420    | 1623    | Alma                 |
| 2420    | 1459    | Henri Fréville       |
| 2420    | 1460    | Argonautes           |
| 2420    | 1461    | Clemenceau           |
| 2420    | 1462    | Combes               |
| 2420    | 1464    | Binquenais           |
| 2420    | 1463    | Binquenais Collège   |
| 2420    | 1465    | Triangle             |
| 2420    | 1353    | Torigné              |
| 2420    | 1466    | Hôpital Sud          |
| 2420    | 1467    | Le Blosne            |
| 2420    | 1356    | Galicie              |
| 2420    | 1468    | La Poterie           |
| 2420    | 3020    | Val Blanc            |
| 2420    | 3021    | Rocade Sud           |
| 2420    | 3008    | Loges                |
| 2420    | 3009    | Chantepie Mairie     |
| 2420    | 3010    | Chantepie Eglise     |
| 2420    | 3022    | Hallouvry            |
| 2420    | 3017    | IDEFS                |
| 2420    | 3016    | Cucé                 |
+---------+---------+----------------------+

现在我想为每个站点添加该站点的可用路线。

首先我连接了stop_ids，但不幸的是，雷恩决定，如果停靠点不是同一栋建筑，那么即使它有 10 米宽，它也不是同一个停靠点。实际上这是有道理的，但这并没有让我们的生活更轻松:)

所以我尝试连接停止名称。这是一个示例Alma：

mysql> select stop_id, stop_name from stops where stop_name = 'Alma';
+---------+-----------+
| stop_id | stop_name |
+---------+-----------+
| 1622    | Alma      |
| 1623    | Alma      |
+---------+-----------+
2 rows in set (0.04 sec)

凉爽的。在那个站点找到可用的路线怎么样？

mysql> select r2.route_id as route_id,
        s2.stop_name as stop_name 
    from stops s2 
    left join stop_times st2 on st2.stop_id = s2.stop_id 
    left join trips t2 on t2.trip_id = st2.trip_id 
    left join routes r2 on r2.route_id = t2.route_id 
    where s2.stop_name = 'Alma' 
    group by r2.route_id;
+----------+-----------+
| route_id | stop_name |
+----------+-----------+
| 0003     | Alma      |
| 0033     | Alma      |
+----------+-----------+
2 rows in set (0.13 sec)

伟大的。当我们在时Alma，我们可以乘坐3路或33路公交车。

现在让我们将这两个查询混合在一起：

select
        first_trip_of_route.trip_id,
        st.stop_id,
        s.stop_name,
        connections.route_id            
from (
    select
        t.trip_id,
        r.route_long_name
    from routes r
    left join trips t on t.route_id = r.route_id
    where r.route_id = '0033'
    limit 1
    ) as first_trip_of_route        
left join stop_times st on st.trip_id = first_trip_of_route.trip_id
left join stops s on s.stop_id = st.stop_id
left join (
    select
        r2.route_id as route_id, s2.stop_name as stop_name
    from stops s2
    left join stop_times st2 on st2.stop_id = s2.stop_id
    left join trips t2 on t2.trip_id = st2.trip_id
    left join routes r2 on r2.route_id = t2.route_id
    group by r2.route_id
    ) connections
    on connections.stop_name = s.stop_name
order by st.stop_sequence

它适用于大多数站点，但正如您所见，它表示 Alma 中没有连接：

+---------+---------+----------------------+----------+
| trip_id | stop_id | stop_name            | route_id |
+---------+---------+----------------------+----------+
| 2420    | 2220    | Gautrais             | NULL     |
| 2420    | 2221    | Rossel               | NULL     |
| 2420    | 2234    | Pommerais            | NULL     |
| 2420    | 2223    | Abbé Grimault        | NULL     |
| 2420    | 2232    | Morinais             | NULL     |
| 2420    | 2202    | Collège Jean Moulin  | NULL     |
| 2420    | 2214    | Médiathèque          | NULL     |
| 2420    | 2204    | Jean Marin           | NULL     |
| 2420    | 2263    | Jean Jaurès          | NULL     |
| 2420    | 2205    | Blosne               | NULL     |
| 2420    | 2225    | Gaité                | NULL     |
| 2420    | 2230    | Rablais Allende      | NULL     |
| 2420    | 2227    | Croix Verte          | NULL     |
| 2420    | 2271    | 25 Fusillés          | NULL     |
| 2420    | 1454    | Bréquigny Piscine    | NULL     |
| 2420    | 1455    | Lycée Bréquigny      | NULL     |
| 2420    | 1456    | Coubertin            | 0213     |
| 2420    | 1456    | Coubertin            | 0212     |
| 2420    | 1457    | Norvège              | NULL     |
| 2420    | 1130    | Canada               | 0033     |
| 2420    | 1623    | Alma                 | NULL     | <<< WTF?
| 2420    | 1459    | Henri Fréville       | 0037     |
| 2420    | 1459    | Henri Fréville       | 0159     |
| 2420    | 1459    | Henri Fréville       | 0074     |
| 2420    | 1459    | Henri Fréville       | 0172     |
| 2420    | 1459    | Henri Fréville       | 0079     |
| 2420    | 1460    | Argonautes           | NULL     |
| 2420    | 1461    | Clemenceau           | NULL     |
| 2420    | 1462    | Combes               | NULL     |
| 2420    | 1464    | Binquenais           | NULL     |
| 2420    | 1463    | Binquenais Collège   | NULL     |
| 2420    | 1465    | Triangle             | 0061     |
| 2420    | 1465    | Triangle             | 0161     |
| 2420    | 1353    | Torigné              | NULL     |
| 2420    | 1466    | Hôpital Sud          | NULL     |
| 2420    | 1467    | Le Blosne            | NULL     |
| 2420    | 1356    | Galicie              | NULL     |
| 2420    | 1468    | La Poterie           | 0214     |
| 2420    | 1468    | La Poterie           | 0075     |
| 2420    | 1468    | La Poterie           | 0173     |
| 2420    | 1468    | La Poterie           | 0073     |
| 2420    | 3020    | Val Blanc            | NULL     |
| 2420    | 3021    | Rocade Sud           | NULL     |
| 2420    | 3008    | Loges                | NULL     |
| 2420    | 3009    | Chantepie Mairie     | NULL     |
| 2420    | 3010    | Chantepie Eglise     | NULL     |
| 2420    | 3022    | Hallouvry            | NULL     |
| 2420    | 3017    | IDEFS                | NULL     |
| 2420    | 3016    | Cucé                 | NULL     |
+---------+---------+----------------------+----------+

是什么赋予了？

4

1 回答 1

-1

好吧，这不是一个好问题。我最终没有按名称链接站点，而是按距离。这是我的最后一个问题，如果有人感兴趣...

select

        first_trip_of_route.trip_id, first_trip_of_route.route_long_name,
        st.stop_id,
        st.departure_time,
        s.stop_name,

        connected_stops.stop_id as connected_stop_id, connected_stops.stop_name as connected_stop_name,
        (6371000*acos(cos(radians(s.stop_lat))*cos(radians(connected_stops.stop_lat))*cos(radians(s.stop_lon)-radians(connected_stops.stop_lon))+sin(radians(s.stop_lat))*sin(radians(connected_stops.stop_lat)))) as connected_stop_distance,

        connected_routes.route_id as connected_route_id, connected_routes.route_long_name as connected_route_name

-- look for the 1st trip of that route
from (
    select
        t.trip_id,
        r.route_long_name
    from routes r
    left join trips t on t.route_id = r.route_id
    where r.route_id = '0033'
    limit 1
    ) as first_trip_of_route

-- get the list of stops taken by that trip
left join stop_times st on st.trip_id = first_trip_of_route.trip_id

-- add info about the stops (stop name)
left join stops s on s.stop_id = st.stop_id

-- look for stops next to this one (200 meters)
left join (
    select stop_id, stop_lat, stop_lon, stop_name
    FROM stops connected_stops
) as connected_stops on 
(6371000*acos(cos(radians(s.stop_lat))*cos(radians(connected_stops.stop_lat))*cos(radians(s.stop_lon)-radians(connected_stops.stop_lon))+sin(radians(s.stop_lat))*sin(radians(connected_stops.stop_lat))))
 < 200
and connected_stops.stop_id <> s.stop_id

-- add all the vehicles that make those stops
left join stop_times connected_stop_times on connected_stop_times.stop_id = connected_stops.stop_id

-- get the trips of those vehicles
left join trips connected_trips on connected_trips.trip_id = connected_stop_times.trip_id

-- get the routes from which these trips belong
left join routes connected_routes on connected_routes.route_id = connected_trips.route_id

-- ensure we get only one connected route per stop 200 meters from the initial searched stop
group by s.stop_id, connected_stop_id, connected_route_id

order by st.stop_sequence;

这是一个有限的输出：

+---------+----------------------+-------------------+----------------------+-------------------------+--------------------+
| stop_id | stop_name            | connected_stop_id | connected_stop_name  | connected_stop_distance | connected_route_id |
+---------+----------------------+-------------------+----------------------+-------------------------+--------------------+
    ... many rows here ...
| 1130    | Canada               | 1449              | Norvège              |          185.0837104437 | 0804               |
| 1130    | Canada               | 1449              | Norvège              |          185.0837104437 | 0059               |
| 1130    | Canada               | 1449              | Norvège              |          185.0837104437 | 0033               |
| 1623    | Alma                 | 1622              | Alma                 |         65.261785846695 | 0003               |
| 1623    | Alma                 | 1622              | Alma                 |         65.261785846695 | 0033               |
| 1459    | Henri Fréville       | 1447              | Henri Fréville       |        97.6477727244322 | 0037               |
| 1459    | Henri Fréville       | 1447              | Henri Fréville       |        97.6477727244322 | 0033               |
    ... many rows here....
+---------+----------------------+-------------------+----------------------+-------------------------+--------------------+
166 rows in set (0.53 sec)

我们可以看到，1623“Alma”站确实与1622“Alma”站（65 米宽）相连，可用路线0003和0033。

于 2014-09-16T22:52:59.077 回答