SQL (Structured Query Language)
SQL is the standard language for managing and querying relational databases. It lets you create, read, update, and delete data in databases like PostgreSQL, MySQL, and SQL Server. SQL is one of the mo…
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Definition
SQL is the standard language for managing and querying relational databases. It lets you create, read, update, and delete data in databases like PostgreSQL, MySQL, and SQL Server. SQL is one of the most fundamental skills in technology — used by developers, data analysts, data scientists, and business analysts. Nearly every application stores data in SQL databases.
Key Points
- Core operations: SELECT, INSERT, UPDATE, DELETE
- JOINs combine data from multiple tables
- Aggregate functions: COUNT, SUM, AVG, GROUP BY for analysis
- PostgreSQL and MySQL are the most popular open-source databases
Related Terms
Frequently Asked Questions
Use SQL (PostgreSQL, MySQL) for structured data with relationships — user accounts, orders, financial data. Use NoSQL (MongoDB, Redis) for unstructured data, caching, or when you need flexible schemas. Most applications use both — SQL for core data and NoSQL/Redis for caching and real-time features.
Basic SQL (SELECT, WHERE, JOINs) can be learned in 1-2 weeks. Intermediate SQL (subqueries, window functions, CTEs) takes 1-2 months of practice. Advanced SQL (query optimisation, indexing, database design) develops over years of experience. For data analytics roles, intermediate SQL is usually sufficient.
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