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Problem

Table: Employees

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| employee_id | int     |
| name        | varchar |
+-------------+---------+
employee_id is the primary key for this table.
Each row of this table indicates the name of the employee whose ID is employee_id.

Table: Salaries

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| employee_id | int     |
| salary      | int     |
+-------------+---------+
employee_id is the primary key for this table.
Each row of this table indicates the salary of the employee whose ID is employee_id.

Write an SQL query 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.

The query result format is in the following example.

Example 1:

Input: 
Employees table:
+-------------+----------+
| employee_id | name     |
+-------------+----------+
| 2           | Crew     |
| 4           | Haven    |
| 5           | Kristian |
+-------------+----------+
Salaries table:
+-------------+--------+
| employee_id | salary |
+-------------+--------+
| 5           | 76071  |
| 1           | 22517  |
| 4           | 63539  |
+-------------+--------+
Output: 
+-------------+
| employee_id |
+-------------+
| 1           |
| 2           |
+-------------+
Explanation: 
Employees 1, 2, 4, and 5 are working at this company.
The name of employee 1 is missing.
The salary of employee 2 is missing.

Code

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 1 ASC