COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Dataset_Opportunity WHERE StageName = 'Closed Won'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Name) AS DistinctValues FROM Dataset_Opportunity WHERE StageName = 'Closed Won'

AVG

Returns the average of the column values.

SELECT CloseDate, AVG(Size) FROM Dataset_Opportunity WHERE StageName = 'Closed Won'  GROUP BY CloseDate

MIN

Returns the minimum column value.

SELECT MIN(Size), CloseDate FROM Dataset_Opportunity WHERE StageName = 'Closed Won' GROUP BY CloseDate

MAX

Returns the maximum column value.

SELECT CloseDate, MAX(Size) FROM Dataset_Opportunity WHERE StageName = 'Closed Won' GROUP BY CloseDate

SUM

Returns the total sum of the column values.

SELECT SUM(Size) FROM Dataset_Opportunity WHERE StageName = 'Closed Won'