COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM AuditTrails WHERE Company = 'CData'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT Id) AS DistinctValues FROM AuditTrails WHERE Company = 'CData'

AVG

Returns the average of the column values.

SELECT Category, AVG(AnnualRevenue) FROM AuditTrails WHERE Company = 'CData'  GROUP BY Category

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), Category FROM AuditTrails WHERE Company = 'CData' GROUP BY Category

MAX

Returns the maximum column value.

SELECT Category, MAX(AnnualRevenue) FROM AuditTrails WHERE Company = 'CData' GROUP BY Category

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM AuditTrails WHERE Company = 'CData'