COUNT

Returns the number of rows matching the query criteria.

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

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Id) AS DistinctValues FROM Tickets WHERE Industry = 'Floppy Disks'

AVG

Returns the average of the column values.

SELECT Subject, AVG(Size) FROM Tickets WHERE Industry = 'Floppy Disks'  GROUP BY Subject

MIN

Returns the minimum column value.

SELECT MIN(Size), Subject FROM Tickets WHERE Industry = 'Floppy Disks' GROUP BY Subject

MAX

Returns the maximum column value.

SELECT Subject, MAX(Size) FROM Tickets WHERE Industry = 'Floppy Disks' GROUP BY Subject

SUM

Returns the total sum of the column values.

SELECT SUM(Size) FROM Tickets WHERE Industry = 'Floppy Disks'