SQL Fundamentals
Work with NULL and Unknown Values
Interpret NULL as missing or unknown information, use IS NULL correctly, and predict how three-valued comparisons affect filtered results.
SQL Fundamentals lessonRelational data foundationsProve
TIMED ASSESSMENT
Work with NULL and Unknown Values
Questions and answer choices are randomized for every attempt. Everything needed to answer is shown on screen; no paper, calculator, terminal, server, or external test is required. Each answer is marked Correct or Incorrect, then locked until the final review.
15 questions20 min timer12/15 to pass
Explanations are hidden during the test. A full review is available only after submission.