作用:返回組中數據窗口的第一個值
語法:select first_value(欄位1) over(PARTITION BY 欄位2 [,欄位3 order by 欄位4 ASC,欄位5 DESC]) from 表名
範例:select distinct first_value(employee_name) over(PARTITION BY dept_id order by input_date desc)
from Employee
作用:返回組中數據窗口的第一個值
語法:select first_value(欄位1) over(PARTITION BY 欄位2 [,欄位3 order by 欄位4 ASC,欄位5 DESC]) from 表名
範例:select distinct first_value(employee_name) over(PARTITION BY dept_id order by input_date desc)
from Employee