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CREATE TABLE tbl (d date, v int); INSERT INTO tbl VALUES ('2022-01-01', 500), ('2022-01-15', 3670), ('2022-01-31', 5670); SELECT d, v - first_value AS diff FROM tbl CROSS JOIN ( SELECT v AS first_value FROM tbl WHERE d = '2022-01-01' ) f WHERE d BETWEEN '2022-01-01' AND '2022-01-31' ;
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