Database-design Questions

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Firebase: use email ID as a key

While modeling with firebase readtime db, stuck with deciding unique key. my users collection is identified as email id. so my aim is
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Retrieve objects by key

I want to structure a participant-list, which contains keys to other objects. my current structure: - events --
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Database list datatype

Hey i got the following problem: foods (is a food (egg, milk, etc) or a recipe (bread, which is made out of eggs, flour, etc)
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How to complete a number in Access?

I am coding an access database as a workshop project. i am using a form to introduce data in a table but i have a little problem. i have two
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UML : Optional Foreign Key

I'm sitting with a little headache about a problem right now. i have two entities payment order and account
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Dishes database relations

I want to create database with recipes. how it should look like? for example let it exist two recipes: first recipe: 2 eggs with
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store Perl hash data in a database

I have written perl code that parses a text file and uses a hash to tally up the number of times a us state abbreviation appears in each
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