Is it possible to create foreign key between to distinct SQL databases ?

Database A contains table [customers] (primary key : customer_id)

Database B contains table [invoices]  (each invoice should be linked to
a customer. Foreign key : customer_id)

I would like to create an integrity constraint between
[invoices].[customer_id] and [customers].[customer_id], despite the fact
that [invoices] et [customers] tables are in SEPARATE databases.

Is it possible to do that ?

Thanks in advance

Tom

The short answer is no. The more complex answer is: Yes, you would have to
enforce cross database constraint integrity using a Trigger. There are
security and other issues that will also have to be addressed.

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