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create table products ( id serial, product varchar, price int ); insert into products (product, price) values ('prod1', 100), ('prod2', 101),('prod3', 1000), ('prod1', 990), ('prod2', 102),('prod3', 562); with p as ( select *, min(price) over() min_price, (max(price) over() - min(price) over()) / 3 step from products ) select id, product, price, case when price < min_price + step then 'low_price' when price < min_price + 2 * step then 'mid_price' else 'high' end as category from p order by price;

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