COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM NorthwindProducts WHERE Industry = 'Floppy Disks'

COUNT(DISTINCT)

Returns the number of distinct, non-null field values matching the query criteria.

SELECT COUNT(DISTINCT PartitionKey) AS DistinctValues FROM NorthwindProducts WHERE Industry = 'Floppy Disks'

AVG

Returns the average of the column values.

SELECT Name, AVG(Price) FROM NorthwindProducts WHERE Industry = 'Floppy Disks'  GROUP BY Name

MIN

Returns the minimum column value.

SELECT MIN(Price), Name FROM NorthwindProducts WHERE Industry = 'Floppy Disks' GROUP BY Name

MAX

Returns the maximum column value.

SELECT Name, MAX(Price) FROM NorthwindProducts WHERE Industry = 'Floppy Disks' GROUP BY Name

SUM

Returns the total sum of the column values.

SELECT SUM(Price) FROM NorthwindProducts WHERE Industry = 'Floppy Disks'