COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM RecruitingCESites WHERE SiteName = 'Bob'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT SiteId) AS DistinctValues FROM RecruitingCESites WHERE SiteName = 'Bob'

AVG

Returns the average of the column values.

SELECT SiteName, AVG(AnnualRevenue) FROM RecruitingCESites WHERE SiteName = 'Bob'  GROUP BY SiteName

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), SiteName FROM RecruitingCESites WHERE SiteName = 'Bob' GROUP BY SiteName

MAX

Returns the maximum column value.

SELECT SiteName, MAX(AnnualRevenue) FROM RecruitingCESites WHERE SiteName = 'Bob' GROUP BY SiteName

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM RecruitingCESites WHERE SiteName = 'Bob'