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CREATE TABLE product ( product VARCHAR(1), avg_rev INTEGER ); INSERT INTO product (product, avg_rev) VALUES ('A', '500'), ('B', '400'), ('C', '250'), ('D', '100');
SELECT product, avg_rev, FIRST_VALUE(avg_rev) OVER (ORDER BY product) - avg_rev AS diff_a FROM product;
product
avg_rev
diff_a
A
500
0
B
400
100
C
250
250
D
100
400