4 qustions

php exercise and need an explanation and answer to help me learn.

Please see the assignment in the attachments and follow the instructions.
Requirements: undefined
Question One
Write SQL queries that perform each of the following tasks:
List all students first names and last names of IT405 course in Riyadh branch.
List all students female ordered by branch name who pass IT405 course with more than or equal 70 (i.e., C) grade.

Question Two
What are the benefits of using your own error-handling function? And write a custom error handler script example.
Question Three
What is header function in PHP? Then explain the following script.
Question Four
Consider the following PHP script for creating a session with name and ID. Write a PHP script to retrieve and print the session global variables, then delete the session.

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