Oracle--开窗函数函数排序rank、desc_rank、row_number

Oracle–开窗函数函数排序rank、desc_rank、row_number

rank() over([partition by par_col] order by order_col):相同数据并列排序并且会跳过并列的应该有的次序

select salary,rank() over(order by salary desc) rn from employees

dense_rank() over([partition by par_col] order by order_col):相同数据并列排序并且接下来的次序不会跳过

select salary,dense_rank() over(order by salary desc) rn from employees

row_number() over([partition by par_col] order by order_col):相同数据不会进行并列排序

select salary,row_number() over(order by salary desc) rn  from employees