基於列中的時間戳的交集，將一個MySQL表的信息追加到另一個列表中

Question

我正在使用MySQL存儲某些事件，其中包含有關誰已完成此事件的信息 以及某個事件發生時的時間戳。我現在將這些信息存儲在兩張表格中，「Cycles」和「Movement_Load」。

現在我想將「Movement_Load」中包含的信息附加到表格「Cycles」中。這個操作的好處是我將所有相關信息存儲在一張表中。

表循環：

(1, '00:50:c2:63:10:1a', 1351508100, 1351508200, 'center', 0, 0); 

表Movement_Load：

(1, 'move_sensor1', 1351508090,  'movement start'), 
(2, 'move_sensor1', 1351508120,  'movement end'), -- 20 not 30, because it starts at 1351508100 
(3, 'move_sensor1', 1351508140,  'movement start'), 
(4, 'move_sensor1', 1351508170,  'movement end'), -- 30 
(5, 'move_sensor1', 1351508190,  'movement start'), 
(6, 'move_sensor1', 1351508210,  'movement end'), -- 10 not 20, because it ends at 1351508200 
                 -- movement sum is 60 
(7,'load_sensor1', 1351508130,  'load start'), 
(8,'load_sensor1', 1351508180,  'load end'), -- 50 
(9,'load_sensor1', 1351508185,  'load start'), 
(10,'load_sensor1', 1351508220,  'load end') -- 15 not 35, because it ends at 1351508200 
                -- load sum is 65 

結果應該是這樣的，運動（60）和負載（65）現在存儲在該表中：

(1, '00:50:c2:63:10:1a', 1351508100, 1351508200, 'center', 60, 65) 

要解決此問題，請參閱我準備好的小提琴：http://sqlfiddle.com/#!2/b1113

Answer 1

UPDATE Cycles 
SET movement_time = 
    (SELECT IFNULL(SUM(CASE event 
         WHEN 'movement start' THEN -timestamp 
         WHEN 'movement end' THEN timestamp 
         ELSE      0 
         END), 0) 
      + CASE (SELECT event 
        FROM Movement_load 
        WHERE timestamp BETWEEN Cycles.startTimestamp 
             AND Cycles.endTimestamp 
         AND event LIKE 'movement %' 
        ORDER BY timestamp 
        LIMIT 1) 
       WHEN 'movement end' THEN -Cycles.startTimestamp 
       ELSE      0 
       END 
      + CASE (SELECT event 
        FROM Movement_load 
        WHERE timestamp BETWEEN Cycles.startTimestamp 
             AND Cycles.endTimestamp 
         AND event LIKE 'movement %' 
        ORDER BY timestamp DESC 
        LIMIT 1) 
       WHEN 'movement start' THEN Cycles.endTimestamp 
       ELSE      0 
       END 
    FROM Movement_Load 
    WHERE timestamp BETWEEN Cycles.startTimestamp 
         AND Cycles.endTimestamp) 

（類似於爲load）