Consider a relation student has Student_id, Student_name, Student_age, Student_Income, Student_address. 

Student
Student_id	Student_name	Student_age	Student_Income (In thousands​)	Student_address
11	Sam	23	null	ABC, Hyderabad, India
12	Ram	25	50	DBC, Mumbai, India
13	Balaji	25	100	ABC, Warangal, India
14	Jan	23	90	ABC, London, England
15	Anne	18	null	DBC, Mumbai, India
16	Don	19	90	ABC, Hyderabad, India

How many rows of information are printed for a given query?

Query:

SELECT Student_age, count(*)

From student

group by Student_age;