COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Accounts WHERE DisplayOrder = '12'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Id) AS DistinctValues FROM Accounts WHERE DisplayOrder = '12'

AVG

Returns the average of the column values.

SELECT LookupName, AVG(AnnualRevenue) FROM Accounts WHERE DisplayOrder = '12'  GROUP BY LookupName

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), LookupName FROM Accounts WHERE DisplayOrder = '12' GROUP BY LookupName

MAX

Returns the maximum column value.

SELECT LookupName, MAX(AnnualRevenue) FROM Accounts WHERE DisplayOrder = '12' GROUP BY LookupName

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM Accounts WHERE DisplayOrder = '12'