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An SQL database is a relational database system that stores structured data in tables and uses SQL as its query language. It provides transactions, integrity constraints and relational modeling. SQL databases are suited for consistent OLTP workloads, while design choices affect latency, scalability and operational effort.
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An SQL database stores structured data in relational tables and provides access through the standardized Structured Query Language.
Relational databases trace back to Edgar F. Codd’s 1970 description of the relational model; SQL now standardizes core querying and data manipulation, while systems add their own dialects.
Tables model entities and relationships; primary and foreign keys connect records. Transactions group changes, constraints protect invariants, and queries select or modify data. Plan indexes, isolation, backups, and migrations around access patterns and failure risks.
Data is organized in tables of rows and columns with relationships between keys.
SQL states which data should be read, joined, filtered, or changed.
A logically related sequence of changes is processed under defined consistency rules.
SQL databases fit structured, consistently related business data and varied queries. Schema, scaling, locking, isolation, backups, and the concrete SQL dialect determine deployment limits.
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