Question

我正在使用sql-server 2005

嗨，我有带有userID和registrationDate的Users表。我希望在第一个日期为x而其他行为x + 10行时选择两个registrationDates之间的最短时间段。我不介意游标，因为我会偶尔运行此查询。

我将再次解释，我需要10个用户注册之间的最短时间，以了解每个特定时间的注册边界是什么。

感谢

Answer 1

如果您使用的是SQL Server 2005或更高版本，请尝试此查询：

WITH T1 AS (
    SELECT
        userID,
        registrationDate,
        ROW_NUMBER() OVER (ORDER BY registrationDate) AS rn
    FROM Users
), T3 AS (
    SELECT
        T1.registrationDate AS interval_start,
        T2.registrationDate AS interval_end,
        T1.registrationDate - T2.registrationDate AS diff
    FROM T1
    JOIN T1 T2
   ON T1.rn = T2.rn + 5
)
SELECT TOP 1 interval_start, interval_end
FROM T3
ORDER BY diff

在sql中选择时间差最小的10行

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