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 [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan'
COUNT(DISTINCT)
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT(DISTINCT Worker_Reference_WID) AS DistinctValues FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan'
AVG
Returns the average of the column values.
SELECT Legal_Name_Last_Name, AVG(Contract_Pay_Rate) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan' GROUP BY Legal_Name_Last_Name
MIN
Returns the minimum column value.
SELECT MIN(Contract_Pay_Rate), Legal_Name_Last_Name FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan' GROUP BY Legal_Name_Last_Name
MAX
Returns the maximum column value.
SELECT Legal_Name_Last_Name, MAX(Contract_Pay_Rate) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan' GROUP BY Legal_Name_Last_Name
SUM
Returns the total sum of the column values.
SELECT SUM(Contract_Pay_Rate) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan'
COUNT
Returns the number of rows matching the query criteria.
SELECT COUNT(*) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan'
COUNT(DISTINCT)
Returns the number of distinct, non-null field values matching the query criteria.
SELECT COUNT(DISTINCT Worker_Reference_WID) AS DistinctValues FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan'
AVG
Returns the average of the column values.
SELECT Legal_Name_Last_Name, AVG(Contract_Pay_Rate) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan' GROUP BY Legal_Name_Last_Name
MIN
Returns the minimum column value.
SELECT MIN(Contract_Pay_Rate), Legal_Name_Last_Name FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan' GROUP BY Legal_Name_Last_Name
MAX
Returns the maximum column value.
SELECT Legal_Name_Last_Name, MAX(Contract_Pay_Rate) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan' GROUP BY Legal_Name_Last_Name
SUM
Returns the total sum of the column values.
SELECT SUM(Contract_Pay_Rate) FROM [CData].[Human_Resources].Workers WHERE Legal_Name_Last_Name = 'Morgan'