"MaFai" <[EMAIL PROTECTED]> wrote:
>
> After I create this table,and add foreign key tno to this table.
> If I delete "tno" in "p_program_type" table,it would alarm that some data still in
> "p_schedule".
> How can I define the "p_schedule" or "p_program_type" table to make sure that while
> delete the tno in p_program_type,the p_schedule table would delete the data matching
> p_schedule table.
>
> create table p_schedule(
> sche_no int not null auto_increment,
> cno int not null,
> prog_no int not null,
> start_time datetime,
> end_time datetime,
> index p_schedule_idx01 (cno),
> foreign key (cno) references p_channel (cno),
> index p_schedule_idx02 (prog_no),
> primary key(sche_no),
> foreign key (prog_no) references p_program( prog_no ),
> foreign key (tno) references p_program_type(tno)
> ) TYPE=INNODB;
Take a look at ON DELETE clause:
http://www.mysql.com/doc/en/InnoDB_foreign_key_constraints.html
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