COUNT

Returns the number of rows matching the query criteria.

SELECT COUNT(*) FROM Clients WHERE Name = 'Bob'

COUNT(DISTINCT)

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

SELECT COUNT(DISTINCT UUID) AS DistinctValues FROM Clients WHERE Name = 'Bob'

AVG

Returns the average of the column values.

SELECT Name, AVG(BalanceMonth) FROM Clients WHERE Name = 'Bob'  GROUP BY Name

MIN

Returns the minimum column value.

SELECT MIN(BalanceMonth), Name FROM Clients WHERE Name = 'Bob' GROUP BY Name

MAX

Returns the maximum column value.

SELECT Name, MAX(BalanceMonth) FROM Clients WHERE Name = 'Bob' GROUP BY Name

SUM

Returns the total sum of the column values.

SELECT SUM(BalanceMonth) FROM Clients WHERE Name = 'Bob'