alter table dd
add m int,n varchar(10),
constraint pk_dd primary key (a,b),
constraint fk_dd_a foreign key (a) references cc(a),
constraint fk_dd_b foreign key (b) references cc(a)
add m int,n varchar(10),
constraint pk_dd primary key (a,b),
constraint fk_dd_a foreign key (a) references cc(a),
constraint fk_dd_b foreign key (b) references cc(a)
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