I am trying to create an App, where user could make an appointmeet for a certain time and date.
The problem is, how to make it impossible for other personts to make an appointment on the time, that has already been taken by another person
To tell the truth I have never made apps in powerApps, but I would like to make this app.
Yes this is completely possible with PowerApps.
Keep in mind that PowerApps is intended to be Apps for your Organization - these are not Apps that anyone can load and use (i.e. not public apps like in the store). I only mention it because it seemed to me like you had a hint of that in your question.
What you ask for will involve allowing users to select their dates and times as you need and then, checking to validate it is not taken prior to "booking". You'll need to choose a data source and a structure for your data, then embark on your journey to build the App.
Post back if you get stuck.
But i would like to give a link to "booking" from site. So a person enters the site and make a booking. It is possible?
It if is possible, what should I read or watch to start solving this issue
I understand how to make a survey via powerApps, but booking is not a simple "form" to enter information
If you are considering putting a link to the App on a public site so that anyone can use the App, then No...each user will need a PowerApps license in order to use it. Not to mention, that each user will need to have access to any datasource that is used in your App.
If you are doing this for your organization where all of the users have licenses and access to the data, then yes, it will be just fine.
For public external users - yes you are correct.
For internal licensed users, no.
You might also look at Microsoft Forms if you want something public facing. Nice thing with that is you can then tie to Flow and PowerApps with the Microsoft Forms connector.
I suppose it would be possible depending on what you're trying to do and how.
You might also want to look at Microsoft Bookings as an already completed application that you could put on a public site. If you're on Office 365 Business license, then that application is already available to you.
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