IN is equivalent to multiple OR statements

IN is equivalent to multiple OR statements

• A. BETWEEN
• B. IN
• C. CAST
• D. NOT

Answer: (B)

The main idea tested is how the IN operator represents membership in a set. IN checks whether a value matches any value in a list, and it’s just a concise form of writing multiple equality checks: x IN (a, b, c) equals x = a OR x = b OR x = c. This makes queries easier to read and maintain when you’re testing against several discrete possibilities. A helpful note: if the list includes NULL, the IN expression can yield UNKNOWN rather than TRUE unless a TRUE match is found, so be mindful of NULLs and consider explicit NULL checks if needed. Other options don’t express membership in a set: BETWEEN tests for a range, CAST converts data types, and NOT simply negates a condition.

The main idea tested is how the IN operator represents membership in a set. IN checks whether a value matches any value in a list, and it’s just a concise form of writing multiple equality checks: x IN (a, b, c) equals x = a OR x = b OR x = c. This makes queries easier to read and maintain when you’re testing against several discrete possibilities.

A helpful note: if the list includes NULL, the IN expression can yield UNKNOWN rather than TRUE unless a TRUE match is found, so be mindful of NULLs and consider explicit NULL checks if needed.

Other options don’t express membership in a set: BETWEEN tests for a range, CAST converts data types, and NOT simply negates a condition.