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CREATE TABLE orders ( order_id INTEGER, amount INTEGER, rating INTEGER, percent FLOAT, customer_id INTEGER, ref_id INTEGER, doc_id INTEGER ); INSERT INTO orders (order_id, amount, rating, percent, customer_id, ref_id, doc_id) VALUES ('1', '1000', '1', '0.6', '112', '8', '5'), ('2', '2000', '2', '0.1', '111', '8', '8'), ('2', '3000', '3', '0.2', '110', '8', '6'), ('3', '4000', '5', '0.1', '100', '7', '7'), ('3', '4000', '2', '0.7', '124', '7', '9'), ('3', '5000', '4', '0.6', '143', '5', '10'), ('4', '2000', '6', '0.4', '125', '4', '11'), ('4', '2500', '1', '0.55', '185', '4', '12'), ('4', '1000', '4', '0.42', '168', '5', '13'), ('4', '1200', '8', '0.8', '118', '1', '14');
10 rows affected
SELECT DISTINCT order_id, FIRST_VALUE(doc_id) OVER ( PARTITION BY order_id ORDER BY amount DESC NULLS LAST, rating DESC NULLS LAST, percent DESC NULLS LAST, customer_id ) doc_id FROM orders;
order_id
doc_id
1
5
4
12
2
6
3
10