COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Payments WHERE CreateTime = '2016-01-15'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Id) AS DistinctValues FROM Payments WHERE CreateTime > '2016-01-15'

AVG

Returns the average of the column values.

SELECT State, AVG(AnnualRevenue) FROM Payments WHERE CreateTime > '2016-01-15'  GROUP BY State

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), State FROM Payments WHERE CreateTime > '2016-01-15' GROUP BY State

MAX

Returns the maximum column value.

SELECT State, MAX(AnnualRevenue) FROM Payments WHERE CreateTime > '2016-01-15' GROUP BY State

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM Payments WHERE CreateTime = '2016-01-15'