Database
What is SQL?
Structured Query Language — the standard language for managing and querying relational databases.
Definition
SQL (Structured Query Language) is a domain-specific language for managing data in relational database management systems (RDBMS). Core operations include SELECT (query), INSERT, UPDATE, DELETE (DML), and CREATE TABLE, ALTER TABLE (DDL). SQL supports JOINs for combining tables, indexes for performance, transactions for data integrity (ACID), and views for abstraction. Used in PostgreSQL, MySQL, SQLite, SQL Server.