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I have this:
ID1 INTEGER PRI
ID2 INTEGER PRI
NAME VARCHAR
now I need to:
ID1_REF INTEGER REFERENCE TO ID1
DESCRIPTION VARCHAR
so, one column refers to one column of primary key, not to 2 column. Is it even possible in relational databases?
No you can’t.
The foreign key must reference either the primary key or another superkey (a set of attributes/columns that uniquely identifies the row in that table, whether or not that is the actual declared primary key) in the referenced table.
It’s worth reading the Wikipedia article as well.