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 and the grade of the students who enrolled the course whose course number is C2.
2. Query the id number and the name of the students who enrolled the course whose course number is C2.
3. Query the id number and the name of the students who enrolled the course whose name is SQL and NoSQL.
4. Query the id number of the student who enrolled C2 or C4 course.