Suppose that there are three relationships in a database:

Student relationship: S(SNO, SNAME, AGE, GENDER, DEPT)

Enroll relationship: SC(SNO, CNO, GRADE)

Course relationship: C(CNO, CNAME)

Here, the abbreviation and their full name correspond as:

SNO	Student Id number	DEPT	Student department
SNAME	Student name	CNO	Course number
AGE	Student age	GRADE	Course grade for certain student
GENDER	Student gender	CNAME	Course name

Query the following in T-SQL format:

1. Query the id number of the students who at least enrolled C2 and C4 courses.
2. Query the id number, name, and age of the students who did not enroll C2 course.
3. Query the names of the students who enrolled all of the courses.
4. Query all of the id number and name of the students who enrolled the courses that were also enrolled by student whose id number is S3.