"Mulugeta Maru" <[EMAIL PROTECTED]> wrote:
> Can a field in one table be a foreign key of another table's field which is
> also a foreign key of a third table?
>
Sure.
For example:
mysql> CREATE TABLE t1 (
-> id int NOT NULL default '0',
-> PRIMARY KEY (id)
-> ) TYPE=InnoDB;
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE TABLE t2 (
-> id int NOT NULL default '0',
-> pid int default NULL,
-> PRIMARY KEY (id),
-> KEY (pid),
-> FOREIGN KEY (pid) REFERENCES t1 (id)
-> ) TYPE=InnoDB;
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE TABLE t3 (
-> id int NOT NULL default '0',
-> pid int default NULL,
-> PRIMARY KEY (id),
-> KEY (pid),
-> FOREIGN KEY (pid) REFERENCES t2 (pid)
-> ) TYPE=InnoDB;
Query OK, 0 rows affected (0.00 sec)
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