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Asked: 2026-06-08T03:09:59+00:00

I have a situation where time spans will be calculated by according to a

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I have a situation where time spans will be calculated by according to a pilot’s date of birth.

Pilots have to get so many hours and such in every 6 month period. I’m annoyed that they aren’t all January-June and July-December, but apparently they have to do this sort of thing by their birth date.

Here’s a reference table:

enter image description here

Now, I need to be able to calculate all the flight hours for each pilot based on their two periods. For example, my birthday is October 23rd. This means my first 6 month period is November 1st through the end of April (of the next year). I’m looking for any ideas on how to create a reference table that will allow me to easily (or as easily as possible) calculate the flight hours for a particular time period.

Here’s what I’ve got so far:

enter image description here

Where birthMonth and startYear together are a composite primary key. startYear is what year the period starts in.

birthMonth is a NVARCHAR(50), startYear an Int, and the rest are Dates.

My pilot table with have birthDate as a full date, and then the flight manager will be able to select the startYear. What do you think? Should I combine the birth month and year into the same field? I’m just attempting to make a schema that will make for easy summing of a particular pilot’s flight hours for their semi-annual and annual. Maybe I could break up the date to not include the year, and then add it dynamically? I just think there are flaws in this design that I’m not thinking of.

EDIT: Here’s all the tables I’m currently working on:
enter image description here

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1 Answer

  1. Editorial Team

    Do you really need a table?

    declare @birthday datetime = '2012-01-09'

SELECT  DATEADD(dd,-(DAY(DATEADD(m,1,@birthday))-1),DATEADD(m,1,@birthday)) firstSixMonthStart,
        DATEADD(dd, -DAY(DATEADD(m,1,@birthday)), DATEADD(m,7,@birthday)) firstSixMonthEnd,
        DATEADD(dd,-(DAY(DATEADD(m,1,@birthday))-1),DATEADD(m,7,@birthday)) secondSexMonthStart,
        DATEADD(dd, -DAY(DATEADD(m,1,@birthday)), DATEADD(m,13,@birthday)) secondSixMonthEnd

firstSixMonthStart      firstSixMonthEnd        secondSexMonthStart     secondSixMonthEnd
----------------------- ----------------------- ----------------------- -----------------------
2012-02-01 00:00:00.000 2012-07-31 00:00:00.000 2012-08-01 00:00:00.000 2013-01-31 00:00:00.000`
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