COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM [INBOX] WHERE Subject = 'Test'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT From) AS DistinctValues FROM [INBOX] WHERE Subject = 'Test'

AVG

Returns the average of the column values.

SELECT Subject, AVG(AnnualRevenue) FROM [INBOX] WHERE Subject = 'Test'  GROUP BY Subject

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), Subject FROM [INBOX] WHERE Subject = 'Test' GROUP BY Subject

MAX

Returns the maximum column value.

SELECT Subject, MAX(AnnualRevenue) FROM [INBOX] WHERE Subject = 'Test' GROUP BY Subject

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM [INBOX] WHERE Subject = 'Test'