REFERENTIALa FOREIGN integrity constraint in another table that
references this table
VARIABLES
specifies the variables involved with this integrity constraint. Otherwise, it is
empty.
WHERE
specifies the WHERE expression for CHECK integrity constraints. Otherwise, it
is empty.
REFERENCE
specifies one of the following integrity constraints:
•For FOREIGN integrity constraints, it specifies the table the foreign key
references.
•For REFERENTIAL integrity constraints, it specifies the table containing the
foreign key.
•Otherwise, ...
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