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'