COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Inbox WHERE From = '[email protected]'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Id) AS DistinctValues FROM Inbox WHERE From = '[email protected]'

AVG

Returns the average of the column values.

SELECT MessageBody, AVG(AnnualRevenue) FROM Inbox WHERE From = '[email protected]'  GROUP BY MessageBody

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), MessageBody FROM Inbox WHERE From = '[email protected]' GROUP BY MessageBody

MAX

Returns the maximum column value.

SELECT MessageBody, MAX(AnnualRevenue) FROM Inbox WHERE From = '[email protected]' GROUP BY MessageBody

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM Inbox WHERE From = '[email protected]'