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sqlalchemy documentation sqlalchemy 2 0 documentation the database toolkit for python home features philosophy statement feature overview testimonials news documentation current documentation version 2 0 documentation by version version 2 1 beta version 2 0 version 1 4 talks and tutorials published content overview community get support participate develop code of conduct github download download current release series 2 0 beta release 2 1 development access license version numbering release status release 2 0 49 current release release date april 3 2026 sqlalchemy 2 0 documentation search terms contents index download this documentation search terms home download this documentation sqlalchemy documentation getting started new to sqlalchemy start here for python beginners installation guide basic guidance on installing with pip and similar for python veterans sqlalchemy overview brief architectural overview tutorials new users of sqlalchemy as well as veterans of older sqlalchemy release series should start with the sqlalchemy unified tutorial which covers everything an alchemist needs to know when using the orm or just core for a quick glance orm quick start a glimpse at what working with the orm looks like for all users sqlalchemy unified tutorial in depth tutorial for core and orm migration notes users coming from older versions of sqlalchemy especially those transitioning from the 1 x style of working will want to review this documentation migrating to sqlalchemy 2 0 complete background on migrating from 1 3 or 1 4 to 2 0 what s new in sqlalchemy 2 0 new 2 0 features and behaviors beyond the 1 x migration changelog catalog detailed changelogs for all sqlalchemy versions reference and how to sqlalchemy orm detailed guides and api reference for using the orm mapping classes mapping python classes relationship configuration using the orm using the orm session orm querying guide using asyncio configuration extensions association proxy hybrid attributes mutable scalars automap all extensions extending the orm orm events and internals other introduction to examples sqlalchemy core detailed guides and api reference for working with core engines connections pools engine configuration connections transactions results asyncio support connection pooling schema definition overview tables and columns database introspection reflection insert update defaults constraints and indexes using data definition language ddl sql statements sql expression elements operator reference select and related constructs insert update delete sql functions table of contents datatypes overview building custom types type api reference core basics overview runtime inspection api event system core event interfaces creating custom sql constructs dialect documentation the dialect is the system sqlalchemy uses to communicate with various types of dbapis and databases this section describes notes options and usage patterns regarding individual dialects postgresql mysql and mariadb sqlite oracle database microsoft sql server more dialects supplementary frequently asked questions a collection of common problems and solutions glossary definitions of terms used in sqlalchemy documentation error message guide explanations of many sqlalchemy errors complete table of of contents full list of available documentation index index for easy lookup of documentation topics copyright 2007 2026 the sqlalchemy authors and contributors flambé the dragon and the alchemist image designs created and generously donated by rotem yaari created using sphinx 9 1 0 documentation last generated mon 04 may 2026 09 06 00 am edt website content copyright by sqlalchemy authors and contributors sqlalchemy and its documentation are licensed under the mit license sqlalchemy is a trademark of michael bayer mike zzzcomputing com all rights reserved website generation by zeekofile with huge thanks to the blogofile project mastodon mastodon