Question at position 44 A single value returned from an SQL query that includes an aggregate function is called a vector aggregate.TrueFalse

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BlackTom AI · Accepted Answer

Question restatement: The statement asks whether a single value returned from an SQL query that includes an aggregate function is called a vector aggregate, with answer options True or False.

Option 1: True. This would claim that the standard result of an aggregate function is a vector aggregate. In mainstream SQL terminology, there is no commonly used term 'vector aggregate' for a single result. Aggregate functions such as SUM, AVG, MAX, MIN, or COUNT typically return a single scalar value for each group (or the entire result if no GROUP BY is present). Labeling this as a 'vector aggregate' is not correct in standard SQL vocabulary.

Option 2: False. This aligns with standard SQL terminology, where the single value produced by an aggregate function is referred to as a scalar value (scalar aggregate) rather than a vector aggregate. The term 'vector' suggests multiple elements or an array-like collection, which would correspond to constructs like ARRAY_AGG or similar, not to a plain aggregate result.

Why the first option is misleading: It conflates the idea of a single-result aggregate with a term that (if used at all) would imply a collection of values. Since an aggregate without ARRAY_AGG or similar functions yields a single scalar per group, calling it a 'vector aggregate' would be techncially inaccurate in standard SQL naming.

Why the second option is accurate: It correctly identifies that the common, standard result of an aggregate calculation is a single scalar value for each grouping, not a vector or array of values.

Common misconceptions to avoid: Assuming 'aggregate' inherently means multiple values; overlooking that grouping determines the number of rows, but each aggregate result per group is a single value. Also assuming 'vector' is a standard SQL term for aggregates; in practice, vector-like results are produced by functions that return arrays or sets, not by basic scalar aggregates.

In summary, the statement is incorrect because the canonical term for a single-value result from an aggregate function is scalar (or scalar aggregate), not vector aggregate. The accurate choice is False.

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