聚合日期范围 SQL

Question

给出下表显示计算机上的登录时间，如果有人可以帮助我编写一个 MS SQL 查询，它将提供表 2 中的聚合时间跨度，我将不胜感激：

表1（数据）：

Usrkey  Username    DateTime_From           DateTime_To

1       Fox         2012-01-01 08:00    2012-01-01 08:15
1       Fox         2012-01-01 08:20    2012-01-01 08:25
2       Foxi        2012-01-01 09:30    2012-01-01 09:40
2       Foxi        2012-01-01 10:20    2012-01-01 10:25
1       Fox         2012-01-01 10:30    2012-01-01 10:35
1       Fox         2012-01-01 11:00    2012-01-01 11:40
2       Foxi        2012-01-01 12:50    2012-01-01 13:25
2       Foxi        2012-01-02 08:20    2012-01-02 08:25
2       Foxi        2012-01-02 09:20    2012-01-02 09:25
1       Fox         2012-01-02 11:30    2012-01-02 11:45
1       Fox         2012-01-02 12:50    2012-01-02 13:00
1       Fox         2012-01-02 13:20    2012-01-02 14:00

Table2（期望的结果）：

Usrkey  Username    RangeFrom           RangeTo
1       Fox         2012-01-01 08:00    2012-01-01 08:25
2       Foxi        2012-01-01 09:30    2012-01-01 10:25
1       Fox         2012-01-02 10:30    2012-01-01 11:40
2       Foxi        2012-01-01 12:50    2012-01-02 09:25
1       Fox         2012-01-02 11:30    2012-01-02 14:00

Answer 1

OP 没有对他们的尝试做出回应，但我仍然建议他们这样做。这是一种不同的方法，使用ROW_NUMBER()，但是，如果您发布您尝试使用LEAD/LAG 的内容，那么我们也可以显示您在那里也出错了。

无论如何：

WITH VTE AS(
    SELECT Usrkey,
           Username,
           CONVERT(datetime2(0),DateTime_From) AS DateTime_From,
           CONVERT(datetime2(0),DateTime_To) AS DateTime_To
    FROM (VALUES (1,'Fox ','2012-01-01T08:00:00','2012-01-01T08:15:00'),
                 (1,'Fox ','2012-01-01T08:20:00','2012-01-01T08:25:00'),
                 (2,'Foxi','2012-01-01T09:30:00','2012-01-01T09:40:00'),
                 (2,'Foxi','2012-01-01T10:20:00','2012-01-01T10:25:00'),
                 (1,'Fox ','2012-01-01T10:30:00','2012-01-01T10:35:00'),
                 (1,'Fox ','2012-01-01T11:00:00','2012-01-01T11:40:00'),
                 (2,'Foxi','2012-01-01T12:50:00','2012-01-01T13:25:00'),
                 (2,'Foxi','2012-01-02T08:20:00','2012-01-02T08:25:00'),
                 (2,'Foxi','2012-01-02T09:20:00','2012-01-02T09:25:00'),
                 (1,'Fox ','2012-01-02T11:30:00','2012-01-02T11:45:00'),
                 (1,'Fox ','2012-01-02T12:50:00','2012-01-02T13:00:00'),
                 (1,'Fox ','2012-01-02T13:20:00','2012-01-02T14:00:00')) V(Usrkey,Username,DateTime_From,DateTime_To)),
Grps AS(
    SELECT Usrkey,
           Username,
           DateTime_From,
           DateTime_To,
           ROW_NUMBER() OVER (ORDER BY DateTime_From ASC) -
           ROW_NUMBER() OVER (PARTITION BY Usrkey ORDER BY DateTime_From ASC) AS Grp
    FROM VTE)
SELECT Usrkey, Username,
       MIN(DateTime_From) AS DateTime_From,
       MAX(DateTime_To) AS DateTime_To
FROM Grps
GROUP BY Usrkey, Username, Grp
ORDER BY DateTime_From ASC;