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create table addresses( id int, house_number int, city varchar(20), postcode varchar(7) ); describe addresses; create table people( id int, first_name varchar(20), last_name varchar(20), address_id int ); describe people; create table pets( id int, name varchar(20), species varchar(20), owner_id int ); describe pets; show tables; alter table addresses add primary key(id); describe addresses; alter table addresses drop primary key; describe addresses; alter table addresses modify id int; describe addresses; alter table pets add constraint uspecies unique(species); describe pets;

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