Question at position 22 Which of the following operator CAN NOT be used with a multiple-row subquery?NOT INBETWEENANYNOT EXIST

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BlackTom AI · Accepted Answer

Question at position 22: Which of the following operator CAN NOT be used with a multiple-row subquery?

Option 1: NOT IN
- This operator can be used with a subquery that returns multiple rows. However, be mindful of NULL handling: if the subquery returns any NULL values, NOT IN can yield UNKNOWN rather than false, which can lead to surprising results unless NULLs are addressed. Despite the NULL caveat, the syntax and semantics allow NOT IN with a multi-row subquery.

Option 2: BETWEEN
- This operator is designed for comparing a single value against a continuous range defined by two scalar bounds (something like x BETWEEN low AND high). It cannot operate against a set of multiple rows produced by a subquery because BETWEEN expects scalar arguments, not a set. Therefore, using BETWEEN with a multiple-row subquery is not valid, as it would require the subquery to return a single value in order to perform the comparison. This makes BETWEEN the incorrect choice for a multi-row subquery.

Option 3: ANY
- The ANY operator is explicitly intended to compare a value to each value returned by a subquery. For example, value > ANY (SELECT something FROM ...). Since it is designed to work with a set of rows produced by a subquery, ANY is valid with a multiple-row subquery.

Option 4: NOT EXISTS
- NOT EXISTS is a logical negation of EXISTS. EXISTS (SELECT ... ) returns true if the subquery yields at least one row; NOT EXISTS returns true if the subquery yields no rows. This construct is commonly used with subqueries that return multiple rows and is perfectly valid for multi-row subqueries.

Summary: Among the given options, BETWEEN is the operator that cannot be used with a multiple-row subquery due to its requirement for scalar bounds, whereas NOT IN, ANY, and NOT EXISTS are compatible with multi-row subqueries (with the caveat about NULL handling for NOT IN).

Question at position 22 Which of the following operator CAN NOT be used with a multiple-row subquery?NOT INBETWEENANYNOT EXIST

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