LeetCode 1378: Replace Employee ID With The Unique Identifier Solution

Master LeetCode problem 1378 (Replace Employee ID With The Unique Identifier), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1378. Replace Employee ID With The Unique Identifier

Easy

Database

Problem Explanation

Explanation

To solve this problem, we need to perform a left join operation on the two tables using the id column as the join condition. We will replace the id column in the Employees table with the unique_id column from the EmployeeUNI table. If an employee does not have a corresponding unique_id, we will show null for that employee.

We will use a LEFT JOIN query to combine the two tables on the id column.
We will select the unique_id column from the EmployeeUNI table and the name column from the Employees table.
If there is no corresponding unique_id for an employee, we will show null for that employee.

Time complexity: O(n + m), where n is the number of rows in the Employees table and m is the number of rows in the EmployeeUNI table. Space complexity: O(n + m) for storing the result.

Solution Code

# Write your Java solution here
String sql = "SELECT EmployeeUNI.unique_id, Employees.name " +
             "FROM Employees LEFT JOIN EmployeeUNI " +
             "ON Employees.id = EmployeeUNI.id";

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