單個表中兩個連續行中時間戳之間的差異

Question

我希望使用單個查詢從波紋管表的兩個連續行中的時間戳之間的時差：

我嘗試了此查詢，但效率非常低，並且服務器超時。

SELECT t1.t_id                                           AS id1, 
       t2.t_id                                           AS id2, 
       t1.timestamp                                      AS timestamp1, 
       t2.timestamp                                      AS timestamp2, 
       Timestampdiff(second, t1.timestamp, t2.timestamp) AS diff 
FROM   (SELECT * 
        FROM   `track`) AS t1, 
       (SELECT * 
        FROM   `track` 
        WHERE  `t_id` != (SELECT `t_id` 
                          FROM   `track` 
                          LIMIT  1)) AS t2 
WHERE  ( t1.t_id - 1 ) = t2.t_id 

Answer 1

像這樣將表自身連接起來（還沒有嘗試過，但是您知道了）

SELECT t1.t_id AS id1, 
   t2.t_id AS id2, 
   t1.timestamp AS timestamp1, 
   t2.timestamp AS timestamp2, 
   Timestampdiff(second, t1.timestamp, t2.timestamp) AS diff
FROM track AS t1
JOIN track AS t2 ON (t2.t_id = t1.t_id - 1)

Answer 2

 SELECT t1.t_id                                           AS id1, 
       t2.t_id                                           AS id2, 
       t1.timestamp                                      AS timestamp1, 
       t2.timestamp                                      AS timestamp2, 
       Timestampdiff(second, t1.timestamp, t2.timestamp) AS diff 
FROM   (SELECT * 
        FROM   `track`) AS t1 Join
       (SELECT * 
        FROM   `track`) AS t2  on ( t1.t_id - 1 ) = t2.t_id  
WHERE  ( t1.t_id - 1 ) = t2.t_id