Databases Beginner

What is SQL?

Structured Query Language — the standard language for managing and querying data in relational databases.

SQL is used to create, read, update, and delete data in relational databases. Key statements include SELECT (query), INSERT (add), UPDATE (modify), DELETE (remove), CREATE TABLE, and ALTER TABLE.

SQL supports complex operations like JOINs (combining tables), GROUP BY (aggregation), subqueries, transactions, and views. Major SQL databases include PostgreSQL, MySQL, SQL Server, and Oracle.

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Related Terms

CTE (Common Table Expression)

A temporary named result set defined within a SQL statement using the WITH clause, improving query readability and enabling recursion.

Connection Pool

A cache of database connections that can be reused, avoiding the overhead of creating new connections for each request.

A technique of dividing large database tables into smaller, more manageable segments while maintaining a single logical table.

A version-controlled change to a database schema that can be applied and reversed systematically.

An advanced open-source relational database known for its reliability, feature richness, and standards compliance.

Database Backup

The process of creating copies of database data to protect against data loss from failures, corruption, or human error.

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