问题
I would like to know if it is possible to use Firebase as a SQL database. I have trouble with relations in NoSQL.
For example: a user belongs to a team, and a team has users.
回答1:
It is not possible to use Firebase in this way. Firebase is a real-time object store. It is not a SQL database and is not intended to be a replacement for one. It completely lacks mechanisms such as JOINs, WHERE query filters, foreign keys, and other tools relational databases all provide. That doesn't mean it isn't a valuable tool. But any attempt to treat it "like" a SQL replacement is going to fail. That's not its purpose.
来源：https://stackoverflow.com/questions/42222347/firebase-database-in-sql