USE tpch1;
select depname, empno, moda(salary) over(partition by depname order by enroll_date) from empsalary order by depname, empno, enroll_date;
depname	empno	moda(salary) over(partition by depname order by enroll_date)
develop	7	5200
develop	8	6000
develop	9	5200
develop	10	5200
develop	11	5200
develop	12	5200
personnel	2	3900
personnel	5	3500
sales	1	5000
sales	3	4800
sales	4	4800
select avg(salary),depname, moda(salary) over(partition by depname order by enroll_date) from empsalary group by depname order by depname, avg(salary);
avg(salary)	depname	moda(salary) over(partition by depname order by enroll_date)
NULL	develop	5200
4200.0000	develop	5200
4500.0000	develop	5200
5200.0000	develop	5200
5200.0000	develop	5200
6000.0000	develop	6000
3500.0000	personnel	3500
3900.0000	personnel	3900
4800.0000	sales	4800
4800.0000	sales	4800
5000.0000	sales	5000