sql - SQL 在按时间分组的时间范围内有效的行数

Question

SQL 服务器

我有一个带有 2 个时间戳的表，time_start 和 time_end。例如

ID    time_start           time_end
----  -------------------  -------------------
1     2019-01-01 08:30:00  2019-01-01 09:40:00
2     2019-01-01 09:10:24  2019-01-01 15:14:19
3     2019-01-01 09:21:15  2019-01-01 09:21:19
4     2019-01-01 10:39:45  2019-01-01 10:58:12
5     2019-01-01 11:39:45  2019-01-01 11:40:10

我想对它们进行分组，这样我就可以将行数按可变时间间隔分组。例如

time_interval         row_count
-------------------   ---------
2019-01-01 07:00:00   0
2019-01-01 08:00:00   1
2019-01-01 09:00:00   3
2019-01-01 10:00:00   2
2019-01-01 11:00:00   1
2019-01-01 12:00:00   0

我的间隔可能是 1 小时、1 分钟、30 分钟、1 天等......

将其视为登录/注销情况，我想查看用户在任何给定的分钟、小时、天等情况下是如何登录的......

标签： sqlsql-servertimestampgroupingintervals

Answer 1

尝试这个，

     DECLARE @start_date datetime='2019-01-01',
                @end_date datetime='2019-01-02',
                @i_minutes int=60

        DECLARE @t TABLE
        (
            id int identity(1,1),time_start datetime,time_end datetime
        )
        INSERT INTO @t(time_start,time_end)VALUES
        ('2019-01-01 08:30:00','2019-01-01 09:40:00'),
        ('2019-01-01 09:10:24','2019-01-01 15:14:19'),
        ('2019-01-01 09:21:15','2019-01-01 09:21:19'),
        ('2019-01-01 10:39:45','2019-01-01 10:58:12'),
        ('2019-01-01 11:39:45','2019-01-01 11:40:10')

        --SELECT @start_date=min(time_start),@end_date=max(time_end)
        --FROM @t

        ;WITH CTE_time_Interval AS
        (
            SELECT @start_date AS time_int,@i_minutes AS i_minutes
            UNION ALL
            SELECT dateadd(minute,@i_minutes,time_int),i_minutes+ @i_minutes
            FROM CTE_time_Interval
            WHERE time_int<=@end_date
        )
        ,CTE1 AS
        (
            SELECT ROW_NUMBER()OVER(ORDER BY time_int)AS r_no,time_int 
            FROM CTE_time_Interval
        )
        ,CTE2 AS
        (
            SELECT a.time_int AS Int_start_time,b.time_int AS Int_end_time 
            FROM CTE1 a
            INNER JOIN CTE1 b ON a.r_no+1=b.r_no
        )

SELECT a.Int_start_time,a.Int_end_time,sum(iif(b.time_start is not null,1,0)) AS cnt
FROM CTE2 a
LEFT JOIN @t b ON
(
    b.time_start BETWEEN a.Int_start_time AND a.Int_end_time 
    OR 
    b.time_end BETWEEN a.Int_start_time AND a.Int_end_time
    OR
    a.Int_start_time BETWEEN b.time_start AND b.time_end
    OR
    a.Int_end_time BETWEEN b.time_start AND b.time_end 
)
GROUP BY a.Int_start_time,a.Int_end_time