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Consider a table object called Person. This table is having fields like age, first_name, last_name and salary.
Following will return average age of all the employee.
Person.average :age |
Following will return maximum age of the employee.
Person.maximum :age |
Following will return minimum age of the employee.
Person.minimum :age |
Follwoing will return sum of salaries of all the employees.
Person.sum :salary, :group => :last_name |
Following will count the number of records having age more than 26.
Person.count(:conditions => "age > 26") |
Following count total number of records.
Person.count |
Check the following link for more detail on Calculation Functions
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