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CREATE TABLE PostOfficeStaff (officeNo int, salary double(9,3)); INSERT INTO PostOfficeStaff VALUES (1, 100), (1, 300), (1, 80); SELECT officeNo, AVG(salary) FROM PostOfficeStaff GROUP BY officeNo; UPDATE PostOfficeStaff JOIN (SELECT AVG(salary) avg_salary FROM PostOfficeStaff) avg_salary ON avg_salary > salary SET salary = salary * 1.05 WHERE officeNo = 1; SELECT * FROM PostOfficeStaff;

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