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-- Hint: use Ctrl+Enter for SQL autocomplete CREATE TABLE Categories ( id int primary key auto_increment, name varchar(64), parent_id int references Categories ); CREATE TABLE Products ( id int primary key auto_increment, name varchar(64), category_id int, foreign key (category_id) references Categories (id) ); INSERT INTO Categories VALUES (1, 'Root category', null), (2, 'Subcategory of Root category', 1); SELECT * FROM Categories;
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