Row_Number()显示行号时间:2023-03-08 21:49:17 SELECT *, Row_Number() OVER (partition by deptid ORDER BY salary desc) rank FROM employee Row_Number()显示行号,加上partition by还能分组排序显示行号。就这么一句sql,每次忘记这个Row_Number()回头一看就什么都明白了。