如何编写访问查询以在同一用户标识中查找时间间隔

Question

我的表格如下：

     userid    pagetag     time
      111       1-2      19:08:02
      111       1-2      19:09:03
      111       1-2      19:10:11
      111       1-2      19:10:12
      113       1-2      13:02:04
      113       1-2      13:04:03
      113       1-2      13:04:08
      115       1-2      14:08:56
      115       1-2      14:14:22
      115       1-2      14:14:25

我希望在同一用户标识中获取时间间隔超过60秒的用户标识。结果如下：

     userid     count
       111       2
       113       1
       115       1

Answer 1

您可以使用子查询：

SELECT 
    LogTable.userid, 
    Count(LogTable.time) AS Over60
FROM 
    LogTable
WHERE 
    DateDiff("s", [time],
        Nz((Select Top 1 [time] 
            From LogTable As T 
            Where T.userid = LogTable.userid And T.time > LogTable.time
            Order By T.time Desc),[time])) > 60
GROUP BY 
    LogTable.userid;