Explain data abstraction and different data models in DBMS. Explain different operations in relational algebra. Consider the following database. Write SQL statements to do the foll... Explain data abstraction and different data models in DBMS. Explain different operations in relational algebra. Consider the following database. Write SQL statements to do the following update on the database schema: 1. Insert a new student ('Johnson', 25, 1, 'Math') in the database. 2. Change the credit hours of course ‘Data Science’ to 4. 3. Delete the record for the student whose name is ‘Smith’ and whose student number is 17. Explain in detail: a) Generalization b) Aggregation. Describe the E-R Diagrams with suitable example. Explain: a) Integrity constraints b) Joins. Explain different types of keys.
Understand the Problem
The question contains several sub-questions that require explanations related to data abstraction, operations in relational algebra, SQL statements for database manipulation, E-R diagrams, and key concepts in database management systems.
Answer
Use SQL to insert, update, and delete records as specified.
The SQL statements for the given tasks are:
- Insert a new student:
INSERT INTO Student (name_s, no_class, major) VALUES ('Johnson', 25, 1, 'Math');
- Change credit hours of 'Data Science':
UPDATE Course SET credit_hours = 4 WHERE c_name = 'Data Science';
- Delete the student 'Smith':
DELETE FROM Student WHERE name_s = 'Smith' AND s_no = 17;
Answer for screen readers
The SQL statements for the given tasks are:
- Insert a new student:
INSERT INTO Student (name_s, no_class, major) VALUES ('Johnson', 25, 1, 'Math');
- Change credit hours of 'Data Science':
UPDATE Course SET credit_hours = 4 WHERE c_name = 'Data Science';
- Delete the student 'Smith':
DELETE FROM Student WHERE name_s = 'Smith' AND s_no = 17;
More Information
Relational Algebra is a core database theory that underpins SQL syntax. Integrity constraints ensure data consistency and accuracy. Joins in SQL allow combining rows from two or more tables based on a related column.
Tips
Ensure matching attributes when performing join operations and respect data types when implementing integrity constraints.
Sources
- Relational Algebra in DBMS: Operations with Examples - Guru99 - guru99.com
- Chapter 15 SQL Structured Query Language – Database Design - opentextbc.ca
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