Create 1378. Replace Employee ID With The Unique Identifier

# finished at 2023/05/05
# Runtime beats 15.78%

Author: Frisk0316

1378. Replace Employee ID With The Unique Identifier

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+/*
+Problem Descirption:
++---------------+---------+
+| Column Name   | Type    |
++---------------+---------+
+| id            | int     |
+| name          | varchar |
++---------------+---------+
+id is the primary key for this table.
+Each row of this table contains the id and the name of an employee in a company.
+
+ 
+
+Table: EmployeeUNI
+
++---------------+---------+
+| Column Name   | Type    |
++---------------+---------+
+| id            | int     |
+| unique_id     | int     |
++---------------+---------+
+(id, unique_id) is the primary key for this table.
+Each row of this table contains the id and the corresponding unique id of an employee in the company.
+
+ 
+
+Write an SQL query to show the unique ID of each user, If a user does not have a unique ID replace just show null.
+
+Return the result table in any order.
+
+The query result format is in the following example.
+
+ 
+
+Example 1:
+
+Input: 
+Employees table:
++----+----------+
+| id | name     |
++----+----------+
+| 1  | Alice    |
+| 7  | Bob      |
+| 11 | Meir     |
+| 90 | Winston  |
+| 3  | Jonathan |
++----+----------+
+EmployeeUNI table:
++----+-----------+
+| id | unique_id |
++----+-----------+
+| 3  | 1         |
+| 11 | 2         |
+| 90 | 3         |
++----+-----------+
+Output: 
++-----------+----------+
+| unique_id | name     |
++-----------+----------+
+| null      | Alice    |
+| null      | Bob      |
+| 2         | Meir     |
+| 3         | Winston  |
+| 1         | Jonathan |
++-----------+----------+
+Explanation: 
+Alice and Bob do not have a unique ID, We will show null instead.
+The unique ID of Meir is 2.
+The unique ID of Winston is 3.
+The unique ID of Jonathan is 1.
+
+*/
+
+# Write your MySQL query statement below
+
+SELECT unique_id, name
+FROM Employees
+LEFT JOIN  EmployeeUNI
+USING (id)