Adobe Campaign Business Practitioner (CBP) Certification Practice Exam

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What does an aggregate function do in a query?

It establishes user permissions
It retrieves data from multiple tables
It computes a single result from a group of values
It increases the size of the dataset

The correct answer is: It computes a single result from a group of values

An aggregate function is a crucial component in querying databases as it allows the computation of a single result from a group of values. This function performs operations such as summing values, calculating averages, or counting occurrences, transforming numerous individual values into a singular derived result. For example, if you have a dataset containing sales figures for various regions, using an aggregate function like SUM will give you the total sales for all regions combined, rather than displaying each individual figure. The other options pertain to different aspects of database management or functionality. Establishing user permissions relates to the security protocols surrounding data access. Retrieving data from multiple tables involves using joins or other methods to integrate information, while increasing the size of the dataset implies adding more records or attributes rather than distilling data down to a single value. Hence, the distinct role of the aggregate function lies in its ability to summarize and condense data efficiently.