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I'm working with GTFS structure for the first time and am having trouble with the queries. I've got the transit data into mysql tables, and am free to query them, but I feel like I'm doing far too many queries and for loops to get the simplest info.

What I'd like to get in a single query is all the departure times and arrival times between two known stops, possibly identified by name.

Here is what I have so far, which involves a query, followed by looping through each trip_id to find the departure and arrival station info + times.

Query 1:

Show all departure times from a particular origin station, going in a particular direction. Result will give departure times and trip_ids.

SELECT t.trip_id, trip_headsign, departure_time, direction_id, s.stop_name 
FROM stops s, routes r, stop_times st, calendar c, trips t 
WHERE departure_time > "00:00:00" and departure_time < "23:59:59" 
AND r.route_id=1 and s.stop_id = 42 
AND s.stop_id = st.stop_id 
AND st.trip_id = t.trip_id   
AND c.service_id = t.service_id   
AND c.monday=1 and direction_id=1;

Result

+---------+---------------+----------------+--------------+-----------+
| trip_id | trip_headsign | departure_time | direction_id | stop_name |
+---------+---------------+----------------+--------------+-----------+
| 5671498 | Grand Central | 04:43:00       |            1 | Garrison  |
| 5671501 | Grand Central | 05:13:00       |            1 | Garrison  |
| 5671504 | Grand Central | 05:43:00       |            1 | Garrison  |
| 5671506 | Grand Central | 06:08:00       |            1 | Garrison  |
| 5671507 | Grand Central | 06:32:00       |            1 | Garrison  |
| 5671513 | Grand Central | 06:53:00       |            1 | Garrison  |
| 5671516 | Grand Central | 07:18:00       |            1 | Garrison  |
| 5671519 | Grand Central | 07:40:00       |            1 | Garrison  |
| 5671521 | Grand Central | 08:03:00       |            1 | Garrison  |
| 5671523 | Grand Central | 08:32:00       |            1 | Garrison  |
| 5671525 | Grand Central | 08:58:00       |            1 | Garrison  |
| 5671526 | Grand Central | 09:27:00       |            1 | Garrison  |
| 5671529 | Grand Central | 10:24:00       |            1 | Garrison  |
| 5671532 | Grand Central | 11:24:00       |            1 | Garrison  |
| 5671535 | Grand Central | 12:24:00       |            1 | Garrison  |
| 5671537 | Grand Central | 13:24:00       |            1 | Garrison  |
| 5671540 | Grand Central | 14:24:00       |            1 | Garrison  |
| 5671542 | Grand Central | 15:24:00       |            1 | Garrison  |
| 5671543 | Grand Central | 16:22:00       |            1 | Garrison  |
| 5671547 | Grand Central | 17:24:00       |            1 | Garrison  |
| 5671550 | Grand Central | 18:24:00       |            1 | Garrison  |
| 5671552 | Grand Central | 19:26:00       |            1 | Garrison  |
| 5671554 | Grand Central | 20:24:00       |            1 | Garrison  |
| 5671556 | Grand Central | 21:24:00       |            1 | Garrison  |
| 5671557 | Grand Central | 22:24:00       |            1 | Garrison  |
| 5671559 | Croton-Harmon | 23:24:00       |            1 | Garrison  |
+---------+---------------+----------------+--------------+-----------+

Query 2:

Give me all the stops on a particular trip along with their arrival times, use trip_id from last query:

SELECT s.stop_id,stop_lat, stop_lon, stop_name, arrival_time, stop_sequence 
FROM stop_times st JOIN stops s ON s.stop_id=st.stop_id 
WHERE trip_id=5671521;

Result

+---------+-----------+------------+------------------+--------------+---------------+
| stop_id | stop_lat  | stop_lon   | stop_name        | arrival_time | stop_sequence |
+---------+-----------+------------+------------------+--------------+---------------+
|      51 | 41.705839 | -73.937946 | Poughkeepsie     | 07:31:00     |             1 |
|      49 | 41.587448 | -73.947226 | New Hamburg      | 07:41:00     |             2 |
|      46 | 41.504007 | -73.984528 | Beacon           | 07:50:00     |             3 |
|      43 | 41.415283 | -73.958090 | Cold Spring      | 07:58:00     |             4 |
|      42 | 41.381780 | -73.947202 | Garrison         | 08:03:00     |             5 |
|      40 | 41.332601 | -73.970426 | Manitou          | 08:08:00     |             6 |
|      39 | 41.285962 | -73.930420 | Peekskill        | 08:17:00     |             7 |
|      37 | 41.246259 | -73.921884 | Cortlandt        | 08:22:00     |             8 |
|      33 | 41.189903 | -73.882394 | Croton-Harmon    | 08:32:00     |             9 |
|       4 | 40.805157 | -73.939149 | Harlem-125th St. | 09:09:00     |            10 |
|       1 | 40.752998 | -73.977056 | Grand Central    | 09:22:00     |            11 |
+---------+-----------+------------+------------------+--------------+---------------+

What I'd really like is a list of departure times and arrival times between two stops, such as this theorized result:

+---------+----------------+----------------+-----------+---------------+--------------+
| trip_id | departure_stop | departure_time | direction | arrival_stop  | arrival_time |
+---------+----------------+----------------+-----------+---------------+--------------+
| 5671521 | Garrison       | 08:03:00       |         1 | Grand Central | 09:22:00     |
| 5671522 | Garrison       | 08:32:00       |         1 | Grand Central | 09:51:00     |    
...etc...
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1 回答 1

7

只需将数据连接在一起，开始和结束连接stops两次，开始和结束停止时间连接stop_times两次，
我唯一不确定的是direction_id从哪里来。
试试下面的查询。
在查询的最后，您可以指定start_s.stop_id和end_s.stop_id代表您查询数据的两个站点。

SELECT t.trip_id,
       start_s.stop_name as departure_stop,
       start_st.departure_time,
       direction_id as direction,
       end_s.stop_name as arrival_stop,
       end_st.arrival_time
FROM
trips t INNER JOIN calendar c ON t.service_id = c.service_id
        INNER JOIN routes r ON t.route_id = r.route_id
        INNER JOIN stop_times start_st ON t.trip_id = start_st.trip_id
        INNER JOIN stops start_s ON start_st.stop_id = start_s.stop_id
        INNER JOIN stop_times end_st ON t.trip_id = end_st.trip_id
        INNER JOIN stops end_s ON end_st.stop_id = end_s.stop_id
WHERE c.monday = 1 
  AND direction_id = 1
  AND start_st.departure_time > "00:00:00" AND start_st.departure_time < "23:59:59" 
  AND r.route_id = 1
  AND start_s.stop_id = 42
  AND end_s.stop_id = 1

我尝试从此链接查找 GTFS 结构示例，但找不到任何内容direction_id

指定停止名称而不是AND start_s.stop_id = 42 AND end_s.stop_id = 1
仅使用AND start_s.stop_name = 'Garrison' AND end_s.stop_name = 'Grand Central'

于 2014-01-19T06:21:45.967 回答