MySQL

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Introduction to MySQL

MySQL is a popular open-source relational database management system known for its reliability, performance, and ease of use. It stores data in tables, supports SQL querying, and powers a wide range of applications from small websites to large-scale enterprise solutions.

Installation & Setup

  • Download from the official website or package manager (APT, Yum).
  • Run the installer and secure with mysql_secure_installation.
  • Configure users, root password, and default database settings.
MySQL Architecture

CRUD Operations

  • CREATE: INSERT INTO table_name (...) VALUES (...);
  • READ: SELECT * FROM table_name WHERE ...;
  • UPDATE: UPDATE table_name SET col = value WHERE ...;
  • DELETE: DELETE FROM table_name WHERE ...;

Advanced Queries

  • JOINS: Combine rows from multiple tables.
  • Subqueries: Nested SELECT statements.
  • Indexes: Speed up data retrieval.
  • Views & Procedures: Virtual tables and stored code blocks.
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Performance & Security

Performance Tuning:

  • Use EXPLAIN to analyze queries.
  • Create indexes on frequently queried columns.
  • Optimize schema: normalize or denormalize appropriately.

Security Best Practices:

  • Use strong passwords and least-privilege users.
  • Enable SSL/TLS for encrypted connections.
  • Regularly backup and patch your MySQL server.

Conclusion

Mastering MySQL setup, CRUD, advanced features, and best practices equips you to build robust, high-performance, and secure database-driven applications.