Terms of Art Glossary

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This page contains a glossary of terms of art which appear, but are not defined, throughout this project's documentation. This page is not a tutorial, just a summary, and many related terms of art are not listed here. Countless web-hosted resources exist which cover, in detail, all of the terminology listed here. Interested readers are encouraged to feed these terms to their internet search engine of choice.

In alphabetical order:

DDL: Data Definition Language is the subset of SQL related to maintenance of database tables: CREATE, DROP, ALTER, etc.
DML: Data Manipulation Language is the subset of SQL related to manipulating the contents of tables: INSERT, UPDATE, DELETE, etc.
DQL: Data Query Language is the subset of SQL related to fetching results, i.e. SELECT. Whether INSERT...RETURNING also qualifies as DQL is a question left to those who define these terms formally.
TCL: Transaction Control Language is the subset of SQL involving transactions: BEGIN, COMMIT, ROLLBACK, etc.
Relational Theory is, in this context, the area of study from which SQL is derived. SQL does not, for reasons of practically, strictly conform to relational theory, but it's a close approximation.
SQL: Structured Query Language is the primary interface between a database and its users. It encompasses DDL, DML, DQL, and TCL (see above).

This page last modified on 2025-07-12 15:11:36 UTC

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