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Aggregate query
Learn Aggregate query in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
Aggregate query is an atomic Apex topic inside SOQL & SOSL. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what Aggregate query changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
AggregateResult[] rows=[SELECT COUNT(Id) total FROM Contact];
Validate the data scope and transaction impact. A correct example must use the actual query or data-change construct named by the lesson.