A common attribute of two tables is called a foreign key if it is the primary in one table.
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True
Reason — A non-key attribute, whose values are derived from the primary key of some other table, is known as a foreign key in its current table.
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A primary key can store empty values in it.
Common attribute of two tables is called a foreign key.
Part of SQL which creates and defines tables and other database objects, is called DDL.
Part of SQL which manipulates data in tables, is called TCL.