COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Opportunities WHERE CreatedBy = 'Jack'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT OptyId) AS DistinctValues FROM Opportunities WHERE CreatedBy = 'Jack'

AVG

Returns the average of the column values.

SELECT Name, AVG(WinProb) FROM Opportunities WHERE CreatedBy = 'Jack'  GROUP BY Name

MIN

Returns the minimum column value.

SELECT MIN(WinProb), Name FROM Opportunities WHERE CreatedBy = 'Jack' GROUP BY Name

MAX

Returns the maximum column value.

SELECT Name, MAX(WinProb) FROM Opportunities WHERE CreatedBy = 'Jack' GROUP BY Name

SUM

Returns the total sum of the column values.

SELECT SUM(WinProb) FROM Opportunities WHERE CreatedBy = 'Jack'