Upload 160

Author: ggeerraarrdd

README.md

@@ -188,6 +188,7 @@ Because this project necessitated a framework to enable consistent daily practic
 | 157   | [Rearrange Products Table](https://leetcode.com/problems/rearrange-products-table/description/)                                                                   | [Solution](solutions/157_rearrange_products_table.md)                                   | LeetCode    | Easy         |                                                                     |
 | 158   | [Calculate Special Bonus](https://leetcode.com/problems/calculate-special-bonus/description/)                                                                     | [Solution](solutions/158_calculate_special_bonus.md)                                    | LeetCode    | Easy         |                                                                     |
 | 159   | [The Latest Login in 2020](https://leetcode.com/problems/the-latest-login-in-2020/description/)                                                                   | [Solution](solutions/159_the_latest_login_in_2020.md)                                   | LeetCode    | Easy         |                                                                     |
+| 160   | [Employees With Missing Information](https://leetcode.com/problems/employees-with-missing-information/description/)                                               | [Solution](solutions/160_employees_with_missing_information.md)                         | LeetCode    | Easy         | FULL JOIN                                                           |
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solutions/160_employees_with_missing_information.md

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+# SQL Everyday \#160
+
+## Employees With Missing Information
+
+Site: LeetCode\
+Difficulty per Site: Easy
+
+## Problem
+
+Write a solution to report the IDs of all the employees with *missing information*. The information of an employee is missing if:
+
+* The employee's *name* is missing, or
+* The employee's *salary* is missing.
+
+Return the result table ordered by `employee_id` *in ascending order*. [[Full Description](https://leetcode.com/problems/employees-with-missing-information/description/)]
+
+## Submitted Solution
+
+```sql
+-- Submitted Solution
+SELECT
+    COALESCE(e.employee_id, s.employee_id) AS employee_id
+FROM Employees AS e
+FULL JOIN Salaries AS s ON e.employee_id = s.employee_id
+WHERE e.name IS NULL
+    OR s.salary IS NULL
+ORDER BY employee_id ASC
+;
+```
+
+## Site Solution
+
+```sql
+-- LeetCode Solution 
+-- Solution #1: Simulate Full Join via Unioning a Left and Right Join
+SELECT 
+  T.employee_id 
+FROM 
+  (
+    SELECT 
+      * 
+    FROM 
+      Employees 
+      LEFT JOIN Salaries USING(employee_id) 
+    UNION 
+    SELECT 
+      * 
+    FROM 
+      Employees 
+      RIGHT JOIN Salaries USING(employee_id)
+  ) AS T 
+WHERE 
+  T.salary IS NULL 
+  OR T.name IS NULL 
+ORDER BY 
+  employee_id;
+
+-- Solution #2: `UNION` with `WHERE ... NOT IN`
+SELECT 
+  employee_id 
+FROM 
+  Employees 
+WHERE 
+  employee_id NOT IN (
+    SELECT 
+      employee_id 
+    FROM 
+      Salaries
+  ) 
+UNION 
+SELECT 
+  employee_id 
+FROM 
+  Salaries 
+WHERE 
+  employee_id NOT IN (
+    SELECT 
+      employee_id 
+    FROM 
+      Employees
+  ) 
+ORDER BY 
+  employee_id ASC
+```
+
+## Notes
+
+TBD
+
+## NB
+
+FULL JOIN
+
+Go to [Index](../?tab=readme-ov-file#index)\
+Go to [Overview](../?tab=readme-ov-file)