Correction: WHERE Student.StudentID = Registration.StudentID and Student.GPA Pro
ID: 3822141 • Letter: C
Question
Correction: WHERE Student.StudentID = Registration.StudentID and Student.GPAProblem 0 points). a. (8 points) Consider the following two relations Persist College: for Student entI StudentName, CampusAddress, GPA) Registration StudentID, CourseID. Grade) You see the following query that makes use of those relations. What does this query mean In other words, how would you describe what this query is asking for SELECT Student studentID, Student,studentName, stration CourseID, Registration.Grade FROM Student, Registration WHERE StudentstudentID Registration StudentID and Registration GPA 3.0 ORDER BY Student StudentName b (2 points) What is the processing order of an SQL query? Be sure to discuss the function of each SQL clause.
Explanation / Answer
1. In the query, it is asked for the Student ID, Student Name,Course ID and grades of the student who have secured more than 3 GPA in his respective registered courses , which is ordered in the ascending order of the Student name alphabetically. This means the details of the students and their courses are printed in which they have scored more than 3 GPA. And the details are displayed in alphabetical way. Here, One student may have registered in multiple courses where he might have got more than 3 GPA score. I am just talking about a possibility.
2. The physical execution of the statement is determined by the query processor and the order may vary from the list which is in the following order::
As we go down the line, the priority of the execution of the clause decreases.
Below I am giving a brief description about each clause mentioned above.
1. The SQL FROM clause is used to list the tables and any joins required for the SQL statement.
2.The ON clause is used to join tables where the column names don’t match in both tables. The join conditions are removed from the filter conditions in the WHERE clause.
3.A JOIN clause is used to combine rows from two or more tables, based on a related column between them.
4.The WHERE clause is used to extract only those records that fulfill a specified condition.
5. The GROUP BY statement is often used with aggregate functions to group the result-set by one or more columns.
6. CUBE operator is used in the GROUP BY clause of a SELECT statement to return a result set of multidimensional (multiple columns) nature.
7. The HAVING clause was added to SQL because the WHERE keyword could not be used with aggregate functions.
8. The SELECT statement is used to fetch the data from a database table which returns this data in the form of a result table.
9. The SELECT DISTINCT statement is used to return only distinct values.
10. The ORDER BY keyword is used to sort the result-set in ascending or descending order.
11. The TOP clause is used to return the top X numbers or N Percent row from the table.
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