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

A centralized repository optimized for analytical queries that integrates data from multiple operational sources.

A database operation that inserts a new row if it does not exist, or updates the existing row if it does.

The process of copying and maintaining database data across multiple servers for redundancy, failover, and read scaling.

A category of databases that store data in non-tabular formats, optimized for specific data models and access patterns.

CTE (Common Table Expression)

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

EXPLAIN ANALYZE

A PostgreSQL command that shows the execution plan of a query along with actual runtime statistics for performance tuning.

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