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[This standard has several versions][version history].\n\nThese facts implies several crucial points:\n\n1. The information_schema views are an amazing, standard way to discover metadata about a given database!\n1. Different versions of the same database and different databases might implement different versions of the standard for information_schema\n1. Since the standard is published by \u003cabbr title=\"the International Standards Organization\"\u003eISO\u003c/abbr\u003e reading it costs a nontrivial amount of money.\n   Thus, volunteer developers _might_ choose to do something nice for themselves rather than shelling out so that they can implement the latest standards.\n\nNaturally, most databases that implement `information_schema` a subset of the standard's views, add extra database-specific views, and stuff otherwise-standard views with database-specific columns.\nThis makes `information_schema` a highly-nonstandard standard. Thinking of `information_schema` as a convention might be more accurate.\n\n\u003chr/\u003e\n\u003cp align=center\u003e \u003cspan style=\"font-family: monospace\" title=\"flipping a table (pun intended)\"\u003e (╯°□°）╯︵ ┻━┻\u003c/span\u003e\u003c/p\u003e\n\u003chr/\u003e\n\n## Motivation\n\nI'd like to use `information_schema` more. Before I do that, however, I'd like to know what views and columns are in the standard or better yet, what views and columns are actually in each database's `information_schema`.\n\n## Inspirations\n\n- [MDN's fantastic compatibility tables efforts](https://github.com/mdn/browser-compat-data)\n- [Can I Use?](https://caniuse.com/ciu/about)\n- [dbdb.io](https://dbdb.io)\n\n\u003c!-- https://simonwillison.net/2020/Oct/9/git-scraping/ --\u003e\n\n## Methodology\n\nI scrape at the public documentation where the documentation licenses allow.\nI also run databases without restrictive EULAs and observe those databases' `information_schema` tables directly.\n\nI prioritize the most popular databases that implement an `information_schema` according to [2024 Stack Overflow Developer Survey](https://survey.stackoverflow.co/2024/technology#most-popular-technologies-database)\n\n| database name | % of respondents use | documentation scraped | `information_schema` queried directly |\n| ------------- | :------------------: | :-------------------: | :-----------------------------------: |\n| `postgres`    |         49%          |          YES          |                  YES                  |\n| `mysql`       |         40%          |          NO           |                  YES                  |\n| `mssql`       |         25%          |          YES          |                  NO                   |\n| `mariadb`     |         17%          |          YES          |                  YES                  |\n| `cockroachdb` |                      |          YES          |                 TODO                  |\n| `tidb`        |                      |          YES          |                 TODO                  |\n\n\u003c!--|       `oracle`       |          13%          |                  NO                   | NO  | --\u003e\n\u003c!--|        `db2`         |          2%           |                  NO                   | NO  | --\u003e\n\n\u003c!-- ===open-source databases=== --\u003e\n  \u003c!-- `presto` --\u003e\n  \u003c!-- `materializedb`: very trivial no information_schema (iirc, just tables+columns) --\u003e\n  \u003c!-- dolt? --\u003e\n  \u003c!-- ksqldb? --\u003e\n  \u003c!-- clickhouse --\u003e\n  \u003c!-- Apache Hive --\u003e\n  \u003c!-- your database here! --\u003e\n\n\u003c!-- ===commercial databases=== --\u003e\n  \u003c!-- `snowflakedb`? --\u003e\n  \u003c!-- `db2`? --\u003e\n  \u003c!-- `oracle` via oracle cloud's free tier? --\u003e\n\n**If note a missing database that implements `information_schema` or evidence of incorrect information, please create a pull request with a fix!**\nSee [`./CONTRIBUTING.md`](./CONTRIBUTING.md) for more details.\n\n\u003c!-- general links --\u003e\n\n[implementors]: https://en.wikipedia.org/wiki/Information_schema#Implementation\n[iso-9075]: https://www.iso.org/standard/63555.html\n[version history]: https://en.wikipedia.org/wiki/SQL#Standardization_history\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fi-s-compat-table%2Fi.s.compat.table","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fi-s-compat-table%2Fi.s.compat.table","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fi-s-compat-table%2Fi.s.compat.table/lists"}