该问题是子查询内的列名无法在外部查询中直接引用,使用别名来为子查询结果集命名,然后在外部查询中引用该别名。以下是一个修正后的查询语句: SELECT last_name, salary FROM (SELECT last_name, salary, RANK() OVER (ORDER BY salary DESC) AS salary_rank FROM employees) AS ran
[python 刷题] 1248 Count Number of Nice Subarrays 题目如下: Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. Return the number of n
mysql执行多表查询时报错: select * from (SELECT EXTRACT(YEAR FROM NOW()) YEAR from DUAL UNIONSELECT EXTRACT(YEAR FROM NOW()) -1 YEAR from DUAL UNIONSELECT EXTRACT(YEAR FROM NOW()) -2 YEAR from DUAL UN