select cell_mobile_number from students where first_name  =  'timmothy' and last_name  =  'ward'
What is the mobile phone number of the student named Timmothy Ward ?
select cell_mobile_number from students where first_name = "timmothy" and last_name = "ward"
select cell_mobile_number from students where first_name = value and last_name = value
What is the mobile phone number of the student named Timmothy Ward ?