The Oracle sum() function returns the average of a numeric field. It is used when you need to find or calculate average of numeric fields value.
To find or calculate average of numeric field in a table, use the following syntax:
tablename: The table name from which you want to fetch records.
col1: The column or field name that will used to calculate average.
condition: To specifies the conditions that must be fulfilled. It is optional.
In the above example, we are calculating average of "workingHours" numeric field value in tblCustomerLoan" table.