What is SQL?
SQL is a language for defining, querying, and modifying data in relational databases. Its core concepts transfer across systems such as PostgreSQL, MySQL, SQLite, and SQL Server.
Where is SQL used?
- Application data storage
- Reporting and business analytics
- Data cleaning and transformation
- Database administration
Prerequisites to learn SQL
- No programming experience is required
- Basic familiarity with tables and rows
- Access to a relational database or SQL playground
Advantages of SQL
- Expressive queries for structured data
- Widely used across industries
- Strong support for consistency and transactions
- Portable core syntax
Limitations of SQL
- Vendor-specific features differ
- Poor queries can be slow at scale
- Schema changes require planning
Start learning SQL
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