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create table t ("data" date, "name" text, dep text, salary int); insert into t values ('2023-03-31', 'Иванов Иван Иванович', 'Департамент 1', 40000), ('2023-03-31', 'Сидоров Валерий Валериевич', 'Департамент 1', 70000), ('2023-04-30', 'Иванов Иван Иванович', 'Департамент 1', 50000), ('2023-04-30', 'Сидоров Валерий Валериевич', 'Департамент 1', 75000); select "data", "name", dep, salary, prev_salary, coalesce(salary - prev_salary, 0) as diff from ( select *, lag(salary) over (partition by "name" order by "data") as prev_salary from t )foo

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