Aggregate Functions
Examples of Aggregate Functions
Below are several examples of SQL aggregate functions. You can use these with a GROUP BY clause to aggregate rows based on the specified GROUP BY criterion. This can be a reporting tool.
COUNT
Returns the number of rows matching the query criteria.
SELECT COUNT(*) FROM Contacts WHERE VID = '123456789'
COUNT(DISTINCT)
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT(DISTINCT City) AS DistinctValues FROM Contacts WHERE VID = '123456789'
AVG
Returns the average of the column values.
SELECT Country, AVG(AnnualRevenue) FROM Contacts WHERE VID = '123456789' GROUP BY Country
MIN
Returns the minimum column value.
SELECT MIN(AnnualRevenue), Country FROM Contacts WHERE VID = '123456789' GROUP BY Country
MAX
Returns the maximum column value.
SELECT Country, MAX(AnnualRevenue) FROM Contacts WHERE VID = '123456789' GROUP BY Country
SUM
Returns the total sum of the column values.
SELECT SUM(AnnualRevenue) FROM Contacts WHERE VID = '123456789'
COUNT
Returns the number of rows matching the query criteria.
SELECT COUNT(*) FROM Contacts WHERE VID = '123456789'
COUNT(DISTINCT)
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT(DISTINCT City) AS DistinctValues FROM Contacts WHERE VID = '123456789'
AVG
Returns the average of the column values.
SELECT Country, AVG(AnnualRevenue) FROM Contacts WHERE VID = '123456789' GROUP BY Country
MIN
Returns the minimum column value.
SELECT MIN(AnnualRevenue), Country FROM Contacts WHERE VID = '123456789' GROUP BY Country
MAX
Returns the maximum column value.
SELECT Country, MAX(AnnualRevenue) FROM Contacts WHERE VID = '123456789' GROUP BY Country
SUM
Returns the total sum of the column values.
SELECT SUM(AnnualRevenue) FROM Contacts WHERE VID = '123456789'