Explanation: An aggregate function performs a calculation on a set of values, and returns a single value. The following are aggregate functions: APPROX_COUNT_DISTINCT AVG CHECKSUM_AGG COUNT COUNT_BIG GROUPING GROUPING_ID MAX MIN STDEV STDEVP STRING_AGG SUM VAR VARP Reference: https://docs.microsoft.com/en-us/sql/t-sql/functions/aggregate-functions-transact-sql?view=sql-server-ver15