Answer / gowrinag

FOREIGN KEY YFK (YNO) REFERENCES Y
ON DELETE CASCADE,
FOREIGN KEY ZFK (ZNO) REFERENCES Z
ON DELETE RESTRICT)
IN OZAGENDB.OZAGENTS;

ex:

CREATE TABLE YZ
(YNO CHAR(5) NOT NULL,
ZNO CHAR(5) NOT NULL,
QTYINTEGER,
PRIMARY KEY (YNO,ZNO),
FOREIGN KEY YFK (YNO) REFERENCES Y
ON DELETE CASCADE,
FOREIGN KEY ZFK (ZNO) REFERENCES Z
ON DELETE RESTRICT)
IN OZAGENDB.OZAGENTS;


---------+---------+---------+---------+---------
YNO ZNO QTY
---------+---------+---------+---------+--------
Y1 Z1 300
Y2 Z2 400

Answer / guest

A foreign key establishes the referential constraint
between a parent table and a dependent table

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