SQL is the standard language for dealing with Relational Databases.
SQL, which stands for Structured Query Language, is a powerful programming language designed for managing and manipulating relational databases. It is widely used for interacting with databases to perform tasks such as querying data, updating records, inserting new data, and more.
Standardization: SQL is an ANSI and ISO standard, ensuring a uniform language for interacting with relational databases across different platforms and vendors.
Ease of Use: SQL syntax is easy and human-readable.
Flexibility: SQL manages and manipulates data, including insertion, deletion, querying, and updating records, as well as defining and modifying database schemas.
Data Integrity: SQL supports various constraints such as primary keys, and foreign keys, checks constraints to enforce data integrity rules, ensuring the consistency and accuracy of data in databases.
Security: SQL databases offer security features, including user authentication, and encryption, to protect sensitive data from unauthorized access and malicious attacks.
Transaction Support: SQL databases support transactions, across multiple database operations to be grouped as a single unit of work. Transactions ensure data consistency and integrity, even system failures or errors.
Performance: Consume high resources and slow query execution which leads to performance issues.
Scalability Challenges: Scaling SQL Databases horizontally across multiple servers is complex and costly compared to NoSQL databases.
Not Suitable for Real-time Analytics: SQL databases may not be well-suited for real-time analytics or handling rapidly changing data, as they are optimized for transactional processing rather than analytical queries.
Select * from products;
SQL is not case-sensitive, we can use SELECT or select, FROM or from as well.
SELECT Command: Retrieves data from one or more tables.
INSERT Command: To Add one or more new records to a table.
UPDATE Command: To Modify one or more existing records in a table.
DELETE Command: Remove one or more records from a table.
CREATE Command: Creates new database objects, such as tables, indexes, or views.
ALTER Command: Alter/Modify the structure of an existing database object.
DROP Command: Deletes a database object.