How to ensure that app users can book the same work period.
I created an ID column on one page and on the other page I will make a schedule with the people I would have chosen
I suspect you want to check out this excellent article on Many-to-Many relationships:
https://www.googlecloudcommunity.com/gc/Tips-Tricks/Many-to-Many-Relationships/m-p/261816#M839
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No Sorry it’s like the template
Shift Scheduling
My waiters can booked some quator of work
but i want to valid or not their presence