COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Contacts WHERE ContactStatus = 'ACTIVE'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Discount) AS DistinctValues FROM Contacts WHERE ContactStatus = 'ACTIVE'

AVG

Returns the average of the column values.

SELECT Name, AVG(Discount) FROM Contacts WHERE ContactStatus = 'ACTIVE'  GROUP BY Name

MIN

Returns the minimum column value.

SELECT MIN(Discount), Name FROM Contacts WHERE ContactStatus = 'ACTIVE' GROUP BY Name

MAX

Returns the maximum column value.

SELECT Name, MAX(Discount) FROM Contacts WHERE ContactStatus = 'ACTIVE' GROUP BY Name

SUM

Returns the total sum of the column values.

SELECT SUM(Discount) FROM Contacts WHERE ContactStatus = 'ACTIVE'