Database CRUD Operations

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Questions and Answers

What does the acronym CRUD stand for in database management?

Create, Read, Update, Delete (correct)

Create, Retrieve, Update, Delete

Create, Read, Undo, Delete

Collect, Read, Update, Delete

Which SQL command is used for creating new records in a database table?

CREATE TABLE

UPDATE

INSERT INTO (correct)

ADD RECORD

What SQL command retrieves all records from a table named Students?

READ ALL FROM Students

SELECT * FROM Students (correct)

GET ALL FROM Students

FETCH * FROM Students

Which operation would you use to modify an existing record in a table?

UPDATE Signup and view all the answers

What would be the result of executing the command 'SELECT * FROM Students'?

It fetches all columns for all rows in the Students table. Signup and view all the answers

To update the major of Prince from 'Mobile Computing' to 'Data Science', which SQL command would you use?

UPDATE Students SET Major = 'Data Science' WHERE StudentID = 101 Signup and view all the answers

What operation is performed when a record is removed from a database table?

DELETE Signup and view all the answers

Which statement is true regarding the Read operation in a database?

It retrieves data without altering it. Signup and view all the answers

What does the UPDATE statement do in the SQL command provided?

It modifies the Major of a specific student. Signup and view all the answers

What is the purpose of the WHERE clause in the DELETE statement?

To filter records so only specific entries are affected. Signup and view all the answers

What happens if the DELETE statement is executed without a WHERE clause?

All rows in the table will be deleted. Signup and view all the answers

What SQL command would you use to add a new student record?

INSERT INTO Students ... Signup and view all the answers

In the given CRUD operations example, which operation comes immediately after reading a student's record?

Updating a student's major. Signup and view all the answers

Which table is used to track the courses that students are enrolled in?

Enrollment table Signup and view all the answers

What should be done to permanently remove a student's record from the database?

Delete the student record with a specific condition. Signup and view all the answers

What sequence of operations defines the complete life cycle of a data record?

Create, Read, Update, Delete Signup and view all the answers

What command is used to add a new student named Eugene to the Students table?

INSERT INTO Students (StudentID, Name, Age, Major) VALUES (104, 'Eugene', 23, 'Cyber Security'); Signup and view all the answers

Which SQL command retrieves details of all students majoring in Mobile Multimedia?

SELECT * FROM Students WHERE Major = 'Mobile Multimedia'; Signup and view all the answers

What is the second step to update Nancy's course enrollment to Operating Systems?

UPDATE Enrollments SET CourseID = 202 WHERE StudentID = 101 AND CourseID = 203; Signup and view all the answers

Which student is to be removed from the Students table according to the instructions?

Prince (StudentID: 102); Signup and view all the answers

What describes the state of the Enrollments table at the beginning of the instructions?

It currently has no entries. Signup and view all the answers

What is the CourseID for the Operating Systems course to which Nancy is to be enrolled?

202; Signup and view all the answers

What is Nancy's StudentID in the Students table?

101; Signup and view all the answers

Which command would likely follow the insertion of a new student in a database?

INSERT INTO Enrollments (StudentID, CourseID) VALUES (104, 201); Signup and view all the answers

Study Notes

CRUD Operations

CRUD stands for Create, Read, Update, and Delete
These are the four fundamental operations for interacting with data in relational databases
These operations form the basis of data manipulation in any database management system (DBMS)
CRUD operations are used for creating, retrieving, updating, and deleting data

Create Operation (INSERT)

The Create operation adds new records to a database table
The SQL command used for create operation is INSERT INTO
Example: INSERT INTO Students (StudentID, Name, Age, Major) VALUES (103, 'Bob', 20, 'Computer Science') adds a new student record to the Students table

Read Operation (SELECT)

The Read operation retrieves data from a database table
The SQL command for reading data is SELECT
Example: SELECT * FROM Students retrieves all records from the Students table
SELECT * FROM Students WHERE Major = 'Mobile Multimedia' obtains details of students with the Mobile Multimedia major

Update Operation (UPDATE)

The Update operation modifies existing records in a database table
The SQL command for updating data is UPDATE
Example: UPDATE Students SET Major = 'Data Science' WHERE StudentID = 101 changes the major of the student with StudentID 101 to Data Science

Delete Operation (DELETE)

The Delete operation removes records from a database table
The SQL command for deleting data is DELETE
Example: DELETE FROM Students WHERE StudentID = 102 removes the record of the student with StudentID 102

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Description

This quiz covers the fundamental CRUD operations in relational databases: Create, Read, Update, and Delete. It includes SQL commands such as INSERT and SELECT, along with examples for better understanding. Master these concepts to effectively manipulate data in any database management system.