Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

A data analyst is working with a customer database and needs to identify all records where the 'FaxNumber' has not been provided. The column containing fax numbers allows for NULL values to indicate that the information is missing. Which SQL query will correctly retrieve only the records where the 'FaxNumber' is unknown?

  • SELECT * FROM Customers WHERE FaxNumber = '';

  • SELECT * FROM Customers WHERE ISNULL(FaxNumber);

  • SELECT * FROM Customers WHERE FaxNumber IS NULL;

  • SELECT * FROM Customers WHERE FaxNumber = NULL;

CompTIA Data+ DA0-002 (V2)
Data Concepts and Environments
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