Suppose we have a table
"Person" as below and we need to find out the frequency of each age.
|
Id
|
LastName
|
FirstName
|
Age
|
City
|
|
1
|
Smith
|
John
|
33
|
Newyork
|
|
2
|
Smith
|
Mike
|
34
|
Boston
|
|
3
|
Paul
|
Ryan
|
39
|
Chicago
|
|
4
|
William
|
Brian
|
45
|
Baltimore
|
|
5
|
Rao
|
Sunita
|
41
|
Dayton
|
|
6
|
Zing
|
Sue
|
33
|
Owings
Mills
|
|
7
|
Smith
|
Robert
|
45
|
Newyork
|
|
8
|
Paul
|
Zean
|
33
|
Chicago
|
|
9
|
Srivastava
|
Hemant
|
33
|
Baltimore
|
|
10
|
Rao
|
Venkat
|
45
|
Dayton
|
We could find out frequency distribution by following SQL query:
SELECT Age, COUNT(Age)AS Frequency
FROM
Persons
GROUP BY Age
ORDER BY
COUNT(Age) DESC