I found this sitting in drafts, short post regarding period overlapping. With simple logic we can eliminate the OR conditions related to all possible combinations.
The possible four cases where period overlap can occur are:
One way we can determine the overlapping periods is if we use OR conditions for all cases, e.g.:
If you are familiar with De Morgan’s laws (from school 🙂 ) then:
With this implemented, we can get the following condition:
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