
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, , , ]
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