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create table addressess( id int, house_number int, city varchar(30), postcode varchar(20)); CREATE TABLE people ( id INT, first_name VARCHAR(30), last_name VARCHAR(30), address_id INT ); create table pets( id int, name varchar(20), species varchar(20), order_id int); alter table pets add primary key (id); alter table pets drop primary key; alter table pets modify id int; alter table pets add constraint foreign key(order_id) references orders(id); select * from addressess; select * from people; select * from pets;

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