Basic Operations - SS3 ICT Lesson Note

Basic Operations in DBMS:

Read Data (SELECT): You can retrieve information from the database using the SELECT statement. For example, SELECT * FROM Customers retrieves all records from the "Customers" table.

 

Update Data (UPDATE): The UPDATE statement allows you to modify existing records in the database. For instance, UPDATE Products SET Price = 15.99 WHERE ProductID = 101 updates the price of a product.

 

Insert Data (INSERT): To add new records, you use the INSERT INTO statement. For example, INSERT INTO Customers (Name, Email) VALUES ('John Doe', '[email protected]') inserts a new customer into the "Customers" table.

 

Delete Data (DELETE): The DELETE statement is used to remove records from a table. For instance, DELETE FROM Orders WHERE OrderID = 123 deletes a specific order.

 

Manage Indexes: Indexes are used to speed up data retrieval. You can create indexes on specific columns to improve query performance.

 

Backup and Restore: Regularly back up your database to prevent data loss. DBMSs provide tools for creating backups and restoring data in case of failures.

 

Security and Access Control: Implement security measures to protect your database. You can grant or restrict access to users and roles, ensuring data privacy.

 

Optimize Queries: Over time, you may need to optimize your database queries for better performance. This can involve rewriting queries, adding indexes, or denormalizing data.

 

In summary, creating a database involves designing its structure, creating tables, and populating them with data. Basic operations include reading, updating, inserting, and deleting data, while also focusing on security, optimization, and maintenance to ensure your database functions effectively and securely.