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 Orders WHERE ParentId = '3'
COUNT(DISTINCT)
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT(DISTINCT ParentId) AS DistinctValues FROM Orders WHERE ParentId = '3'
AVG
Returns the average of the column values.
SELECT Total, AVG(AnnualRevenue) FROM Orders WHERE ParentId = '3' GROUP BY Total
MIN
Returns the minimum column value.
SELECT MIN(AnnualRevenue), Total FROM Orders WHERE ParentId = '3' GROUP BY Total
MAX
Returns the maximum column value.
SELECT Total, MAX(AnnualRevenue) FROM Orders WHERE ParentId = '3' GROUP BY Total
SUM
Returns the total sum of the column values.
SELECT SUM(AnnualRevenue) FROM Orders WHERE ParentId = '3'
COUNT
Returns the number of rows matching the query criteria.
SELECT COUNT(*) FROM Orders WHERE ParentId = '3'
COUNT(DISTINCT)
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT(DISTINCT ParentId) AS DistinctValues FROM Orders WHERE ParentId = '3'
AVG
Returns the average of the column values.
SELECT Total, AVG(AnnualRevenue) FROM Orders WHERE ParentId = '3' GROUP BY Total
MIN
Returns the minimum column value.
SELECT MIN(AnnualRevenue), Total FROM Orders WHERE ParentId = '3' GROUP BY Total
MAX
Returns the maximum column value.
SELECT Total, MAX(AnnualRevenue) FROM Orders WHERE ParentId = '3' GROUP BY Total
SUM
Returns the total sum of the column values.
SELECT SUM(AnnualRevenue) FROM Orders WHERE ParentId = '3'