SQL Challenge: Skip Weekends

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От Josh Berkus
Тема SQL Challenge: Skip Weekends
Дата
Msg-id 200206201713.03801.josh@agliodbs.com
обсуждение исходный текст
Список pgsql-sql
Folks,

Hey, I need to write a date calculation function that calculates the date
after a number of *workdays* from a specific date.   I pretty much have the
"skip holidays" part nailed down, but I don't have a really good way to skip
all weekends in the caluclation.  Here's the ideas I've come up with:

Idea #1: Use a reference table
1. Using a script, generate a table of all weekends from 2000 to 2050.
2. Increase the interval by the number of weekends that fall in the relevant
period.

Idea #2:  Some sort of calculation using 5/7 of the interval, adjusted
according to the day of the week of our starting date.  My head hurts trying
to figure this one out.

--
-Josh Berkus





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