Need sql query for all these operations

Develop a hospital database application with following features

a. Create a structure for patient and another structure for doctor

b. Enter patient details, should fill the structure and insert in into a file

. c. Delete patient details should delete the details from the file.

d. Search patient details should find a patient by name in the file (i.e. data base)

e. Enter doctor details, should fill the structure and insert in into a file.

f. Delete doctor details should delete the details from the file.

g. Search patient details should find a patient by name in the file (i.e. data base)

h. Search doctor details should find a doctor by name in the file (i.e. data base)

i. A doctor treats a patient, and writes subscription. Save the subscription.