SQL Reference
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Quick Reference

The IS NULL keywords are used to test for empty values (NULL values).

The following lists all customers (using the first_name and last_name columns) with a NULL value in the country field.

SELECT first_name, last_name, country
FROM Customers
WHERE country IS NULL;

SQL Notes:

  • Any work being done to modify the structure of a database or delete tables or the the database itself should only be done after making a recent backup
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