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  • Examples
  • Sample Database
#1
SELECT NULL = 5;
#2
SELECT NULL = NULL;
#3
SELECT
	employee_id,
	first_name,
	last_name,
	phone_number
FROM
	employees
WHERE
	phone_number = NULL;
#4
SELECT
	employee_id,
	first_name,
	last_name,
	phone_number
FROM
	employees
WHERE
	phone_number IS NULL;
#5
SELECT
	employee_id,
	first_name,
	last_name,
	phone_number
FROM
	employees
WHERE
	phone_number IS NOT NULL;
Table List
countries
SELECT * FROM countries;
departments
SELECT * FROM departments;
dependents
SELECT * FROM dependents;
employees
SELECT * FROM employees;
jobs
SELECT * FROM jobs;
locations
SELECT * FROM locations;
regions
SELECT * FROM regions;
  • SQL Query
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  • Result