COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Account WHERE acctName = 'Checking'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT InternalId) AS DistinctValues FROM Account WHERE acctName = 'Checking'

AVG

Returns the average of the column values.

SELECT AcctName, AVG(AnnualRevenue) FROM Account WHERE acctName = 'Checking'  GROUP BY AcctName

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), AcctName FROM Account WHERE acctName = 'Checking' GROUP BY AcctName

MAX

Returns the maximum column value.

SELECT AcctName, MAX(AnnualRevenue) FROM Account WHERE acctName = 'Checking' GROUP BY AcctName

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM Account WHERE acctName = 'Checking'