摘要：RT https://leetcode.cn/problems/replace-employee-id-with-the-unique-identifier/solution/ select b.unique_id, a.name from Employees a left join Employe 阅读全文

摘要：leetcode 2619 遇到了 ?? 语法糖，简而言之 可选链功能 就是防止抛出异常 caught TypeError: Cannot read properties of undefined (reading 'salary') at <anonymous>:1:12 const user = 阅读全文