RANK()

當前行在其分割槽內的秩，帶間隙

select
	name,
	department,
	salary,
	rank() over (partition by department
order by
	salary) as value
from
	user;

select
	name,
	department,
	salary,
	DENSE_RANK() over (partition by department
order by
	salary) as value
from
	user;
 

select
	name,
	department,
	salary,
	PERCENT_RANK() over (partition by department
order by
	salary) as value
from
	user;

select
   name,
   department,
   salary,
   ROW_NUMBER() over (partition by department
order by
   salary) as value
from
   user;
 

select
   name,
   department,
   salary,
   FIRST_VALUE(salary) over (partition by department
order by
   salary) as value
from
   user;