COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Customer WHERE Name = 'CData, Inc.'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT No) AS DistinctValues FROM Customer WHERE Name <> 'CData, Inc.'

AVG

Returns the average of the column values.

SELECT Contact, AVG(AnnualRevenue) FROM Customer WHERE Name <> 'CData, Inc.'  GROUP BY Contact

MIN

Returns the minimum column value.

SELECT MIN(AnnualRevenue), Contact FROM Customer WHERE Name <> 'CData, Inc.' GROUP BY Contact

MAX

Returns the maximum column value.

SELECT Contact, MAX(AnnualRevenue) FROM Customer WHERE Name <> 'CData, Inc.' GROUP BY Contact

SUM

Returns the total sum of the column values.

SELECT SUM(AnnualRevenue) FROM Customer WHERE Name = 'CData, Inc.'