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  1. SQL (Structured Query Language) is a specialized programming language designed for managing and manipulating data stored in relational databases. It is particularly useful for handling structured data, which involves relations among entities and variables.

    Key Principles

    SQL was introduced in the 1970s and became one of the first commercial languages to use Edgar F. Codd's relational model. It was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce and was originally called SEQUEL (Structured English Query Language). SQL became a standard of the American National Standards Institute (ANSI) in 1986 and of the International Organization for Standardization (ISO) in 1987.

    Components and Capabilities

    SQL consists of several types of statements, which can be informally classified into sublanguages:

    • Data Query Language (DQL): Used for querying data.

    • Data Definition Language (DDL): Used for defining database schemas.

    • Data Control Language (DCL): Used for controlling access to data.

    • Data Manipulation Language (DML): Used for inserting, updating, and deleting data.

  1. SQL - Wikipedia

    SQL is a domain-specific language for managing data in relational databases. Learn about its origins, features, dialects, and evolution from IBM and Oracle to ISO/IEC standards.

  2. Structured Query Languageとは|「分かりそう」で「 …

    12 aug. 2020 · 「Structured Query Language」の説明です。 正確ではないけど何となく分かる、IT用語の意味を「ざっくりと」理解するためのIT用語辞典です。 …

  3. What is Structured Query Language (SQL)? - IBM

    24 dec. 2025 · Structured Query Language (SQL) is a domain-specific, standardized programming language used to interact with relational database management …

  4. SQL Introduction - W3Schools

    Learn what SQL is, what it can do, and how to use it in your web site. SQL is a standard language for accessing and manipulating databases, but different …

  5. Structured Query Language (SQL) - GeeksforGeeks

    17 mrt. 2026 · Structured Query Language (SQL) is the standard language used to interact with relational databases. It allows users to store, retrieve, update and …

  6. What is SQL? - Structured Query Language (SQL) Explained ...

    26 mrt. 2026 · Structured query language (SQL) is a programming language for storing and processing information in a relational database. A relational database stores information in tabular form, with …

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  8. SQL Tutorial - Learn Structured Query Language

    11 feb. 2026 · SQL, which stands for Structured Query Language, is a standardized computer language defined by the ANSI (American National Standards Institute). …

  9. SQL Tutorial

    SQL Tutorial Our SQL tutorial helps you learn SQL (Structured Query Language) in simple and easy steps so that you can start your database programming quickly. …

  10. Structured Query Language (SQL) - ODBC API Reference

    17 okt. 2024 · Many query languages were developed for this purpose, but one of these became the most popular: Structured Query Language, invented at IBM in the 1970s. It is more commonly known …

  11. What is Structured Query Language (SQL)? - TechTarget

    27 aug. 2024 · Structured Query Language (SQL) is a standardized programming language that is used to manage relational databases and perform various …

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