juniorSQL

What is SQL and why is it used?

Updated May 17, 2026

Short answer

SQL is a standard language used to manage and query relational databases.

Deep explanation

SQL (Structured Query Language) is used to create, read, update, and delete data in relational database systems. It provides a declarative way to interact with structured data stored in tables.

Real-world example

Fetching all customer records from a banking system.

Common mistakes

  • Confusing SQL with NoSQL databases.

Follow-up questions

  • Is SQL case-sensitive?
  • What are SQL dialects?

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