refactor 1378

Author: fishercoder1534

database/_1378.sql

@@ -1,71 +1,3 @@
---1378. Replace Employee ID With The Unique Identifier
---
---Table: Employees
---
---+---------------+---------+
---| 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 doesn't have a unique ID replace just show null.
---
---Return the result table in any order.
---
---The query result format is in the following example:
---
---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         |
---+----+-----------+
---
---EmployeeUNI table:
---+-----------+----------+
---| unique_id | name     |
---+-----------+----------+
---| null      | Alice    |
---| null      | Bob      |
---| 2         | Meir     |
---| 3         | Winston  |
---| 1         | Jonathan |
---+-----------+----------+
---
---Alice and Bob don't 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 uni.unique_id, emp.name from Employees emp