student(sid, sname, sex, age, year, gpa) dept(dname, numphds) prof(pname, dname) course(cno, cname, dname) major(dname, sid) section(dname, cno, sectno, pname) enroll(sid, grade, dname, cno, sectno) Write the following SQL queries for the schema above: Print the course names, course numbers and section numbers of all classes with less than six students enrolled in them. Print the name(s) and sid(s) of the student(s) enrolled in the most classes. Print the names of departments that have one or more majors who are under 18 years old. Print the names and majors of students who are taking one of the College Geometry courses. For those departments that have no majors taking a College Geometry course, print the department name and the number of PhD students in the department. Print the names of students who are taking both a Computer Sciences course and a Mathematics course. For each department that has one or more majors with a GPA under 1.0, print the name of the department and the average GPA of its majors.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
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student(sid, sname, sex, age, year, gpa)
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dept(dname, numphds)
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prof(pname, dname)
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course(cno, cname, dname)
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major(dname, sid)
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section(dname, cno, sectno, pname)
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enroll(sid, grade, dname, cno, sectno)
Write the following SQL queries for the schema above:
- Print the course names, course numbers and section numbers of all classes with less than six students enrolled in them.
- Print the name(s) and sid(s) of the student(s) enrolled in the most classes.
- Print the names of departments that have one or more majors who are under 18 years old.
- Print the names and majors of students who are taking one of the College Geometry courses.
- For those departments that have no majors taking a College Geometry course, print the department name and the number of PhD students in the department.
- Print the names of students who are taking both a Computer Sciences course and a Mathematics course.
- For each department that has one or more majors with a GPA under 1.0, print the name of the department and the average GPA of its majors.
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