Mengapa kemas kini lata MYSQL gagal Sebarang nasihat?

Question

gunakan my_foreign;

buat jadual myforeign2(

id int primary key auto_increment,

name varchar(20) not null,

c_id int,

my reference.myclass my_class)reference(c_set my_class) null on update cascade

);

use my_class;

update myclass set id =4 di mana id = 3;

select * from myclass;

use my_foreign;

select * dari my tidak dikemas kini