Convert number of minutes to hh:mm

问题

I have a column in a table that stores the number of minutes as a numeric(18,4) field named [course_access_minutes].

The stored values come from a blackboard database and look like this:

How do I convert these to time hh:mm, I've had a good look at the database documentation and all I can find is

course_access_minutes numeric(18,4) This is the number of minutes that the user accesses this course in total during this login session.

Can I assume that I can make a direct conversion from minutes into hours? I think I will take any values below 1 as 0 minutes. What is the best way to do this in SQL? Thanks in advance for your help.

回答1:

Try this

SELECT CONVERT(varchar, DATEADD(s, 625.8167 * 60, 0), 108)

If the duration is longer than 24 hours you can use this

SELECT CONVERT(varchar, CAST(1877.4501 * 60 AS int) / 3600) 
    + RIGHT(CONVERT(varchar, DATEADD(s, 1877.4501 * 60, 0), 108), 6)

回答2:

You could use FLOOR like this

DECLARE @SampleData AS TABLE
(
    Minutes numeric(18,4)
)

INSERT INTO @SampleData
VALUES
( 0.0500),
( 1.0500),
( 30.0500),
( 80.0500),
( 314.0833),
( 625.8167)

SELECT CONCAT(floor(sd.Minutes/60),':', CASE    WHEN sd.Minutes - floor(sd.Minutes/60)*60 < 1 THEN '0'
                                                ELSE FLOOR(sd.Minutes - floor(sd.Minutes/60)*60 )
                                        END) AS hours
FROM @SampleData sd

Returns

hours
0:0
0:1
0:30
1:20
5:14
10:25

回答3:

WITH _Samples AS (
    SELECT CONVERT(numeric(18, 4), 0.0500) [course_access_minutes]
    UNION ALL SELECT 0.0667
    UNION ALL SELECT 0.3667
    UNION ALL SELECT 314.0833
    UNION ALL SELECT 625.8167
) 
SELECT 
    S.course_access_minutes, 

    -- split out the number
    FLOOR(S.course_access_minutes / 60) [hours], 
    FLOOR(S.course_access_minutes % 60) [minutes], 
    FLOOR((S.course_access_minutes - FLOOR(S.course_access_minutes)) * 60) [seconds], 

    -- to a string
    CONVERT(varchar(10), FLOOR(S.course_access_minutes / 60)) 
    + ':' + RIGHT('00' + CONVERT(varchar(10), FLOOR(S.course_access_minutes % 60)), 2)
    + ':' + RIGHT('00' + CONVERT(varchar(10), FLOOR((S.course_access_minutes - FLOOR(S.course_access_minutes)) * 60)), 2) [time_string], 

    -- You could consider converting to the time data type if the values will never exceed the limit
    -- time supports 00:00:00.0000000 through 23:59:59.9999999
    -- 0 through 1439.9833333 ... 23 * 60 = 1380 + 59 = 1439 + (59 / 60) = 1439.9833333 
    -- (see: https://docs.microsoft.com/en-us/sql/t-sql/data-types/time-transact-sql)
    CONVERT(time, 
        CONVERT(varchar(10), FLOOR(S.course_access_minutes / 60)) 
        + ':' + RIGHT('00' + CONVERT(varchar(10), FLOOR(S.course_access_minutes % 60)), 2)
        + ':' + RIGHT('00' + CONVERT(varchar(10), FLOOR((S.course_access_minutes - FLOOR(S.course_access_minutes)) * 60)), 2) 
    ) [time]
FROM 
    _Samples S

(It wouldn't be difficult to further this idea and split out the fractional seconds as well.)

Which yields:

course_access_minutes  hours  minutes  seconds  time_string  time
---------------------- ------ -------- -------- ------------ ----------------
0.0500                 0      0        3        0:00:03      00:00:03.0000000
0.0667                 0      0        4        0:00:04      00:00:04.0000000
0.3667                 0      0        22       0:00:22      00:00:22.0000000
314.0833               5      14       4        5:14:04      05:14:04.0000000
625.8167               10     25       49       10:25:49     10:25:49.0000000

回答4:

Note that this is going to be like Greg's answer, but I wanted to explain and simplify it.

You have minutes, so dividing them by 60 and flooring it (removing the decimal) gives the hours (without the minutes).

If you take the total minutes again, and remove (mod it by) the floored hours - which requires conversion to minutes by multiplying by 60 - you are left with the remaining minutes by essentially just finding out what is left after taking away that many groups of sixties:

SELECT FLOOR(course_access_minutes / 60) as Hours,
(FLOOR(course_access_minutes) % 60) as Minutes
FROM MyTable

If you want the decimal to appear for the amount of minute fractions (you want the seconds to appear, in decimal form), remove FLOOR.

If you want seconds in real numbers, keep FLOOR and use what Greg had: FLOOR((S.course_access_minutes - FLOOR(S.course_access_minutes)) * 60) for seconds. Be careful with the parenthesis, though, because you can end up accidentally flooring your decimaled minutes and get 0, and then 0*60 is zero:

FLOOR(
    (
        course_access_minutes - 
        FLOOR(course_access_minutes)
    ) * 60
) as Seconds

来源：https://stackoverflow.com/questions/44203036/convert-number-of-minutes-to-hhmm

标签

sql-server

time

blackboard