SQL Database

Learn Structured Query Language (SQL) to store, manage, and retrieve data efficiently in relational databases.

SQL Basics

SQL is a standard language used to communicate with relational databases like MySQL, Oracle, and PostgreSQL.

Data is stored in tables consisting of rows and columns for structured storage.

Unique identifiers used to distinguish each record in a table.

Data Definition Language: CREATE, ALTER, DROP used to manage database structure.

Data Manipulation Language: INSERT, UPDATE, DELETE used to modify records.

Data Query Language: SELECT used to retrieve data from tables.

Combine data from multiple tables using INNER JOIN, LEFT JOIN, RIGHT JOIN.

Improve database performance by speeding up data retrieval operations.

Reusable SQL code blocks that can be executed to perform complex operations.