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Limiting new table record: How to make a write condition that checks the interval between 2 dates?

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Joana Damas

on 21/11/19, 15:16 • 1657 visualizações

I have the tables PERSON (field: name) and LOCPERSON (fields: foreignkeyPERSON, local, begindate, enddate), which I want to use to know where the person was at any given date.

How do I make sure that a person is not at 2 locals at the same time? i.e. when I create a new record in LOCPERSON, how do I make sure I'm not inserting the same person at another local in the same time interval of an already existing record with that person?

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Tiago Xavier

Ligar 21/11/19, 16:28

Here is one example where I have one period with fields "DtStartA" and "DtEndA", and other period with fields "DtStartB" and "DtEndB".

Another field will be check formula with name "check" like you can see were:

With that example you can make a arithmetic formula like this:

iif(ComparaDatas(iif([DTEX->DTSTARTA] > [DTEX->DTSTARTB], [DTEX->DTSTARTA], [DTEX->DTSTARTB]), iif([DTEX->DTENDA] < [DTEX->DTENDB], [DTEX->DTENDA], [DTEX->DTENDB])) <= 0, 1, 0)

The return on this example will be logical and is true when you have conflit between two period of dates.

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Asked: 21/11/19, 15:16
Seen: 1657 times
Last updated: 26/11/19, 10:09