Wikipedia:Database queries: Difference between revisions

Revision as of 06:54, 11 October 2014

Revision as of 08:51, 11 October 2014

Line 1:

{{shortcut|WP:SQL}}

SELECT CONCAT("Wikipedia:",cur_title) AS cur_title FROM cur

WHERE cur_namespace=4 AND cur_is_redirect=0 ORDER BY

{{nutshell|Queries can be run against the Wikipedia database in a variety of ways}}

cur_title

== Overview ==

Much of the data that makes up the Wikipedia encyclopaedia is stored in a [[SQL database]]. It can sometimes be useful to run queries against this database to extract information that is otherwise hard to find. For example:

* Articles with ''H.M.S.'' in their title that have not been edited for 12 months.

* [[WP:Redirect|Redirects]] with fewer than 20 incoming links that redirect to [[WP:Category|categories]]

* All [[WP:Red link|red links]] on pages within the scope of a particular [[WP:WikiProject|WikiProject]]

Many simple queries can be run directly using the tools built into the [[MediaWiki]] package used by Wikipedia. Some of the most popular and useful queries are run regularly and can be found at [[Wikipedia:Database reports]]. If neither of these suits your query, you can request that someone run a query for you, or download your own copy of the database to work on.

== Using the MediaWiki tools ==

Some queries can be satisfied through the MediaWiki interface:

* [http://en.wikipedia.org/w/index.php?title=Special:Search&search=&fulltext=Search&profile=advanced&redirs=1 Search in advanced mode]

* [[Special:PrefixIndex|All pages with prefix]]

* [[Special:CategoryTree|Category tree]]

* [[mw:API|MediaWiki API]] (see [[Special:ApiSandbox]])

== Queries that are already run regularly ==

Useful queries that are regularly run can be found at:

* [[Special:SpecialPages]]

* [[Wikipedia:Database reports]]

* [[Wikipedia:Statistics]]

And many other places.

== Requesting that a query be run ==

Some Wikipedians have the ability to run queries on a copy of the live database on the [[WP:Wikimedia Labs|Wikimedia Labs]]. You may request they do this at [//quarry.wmflabs.org/ Quarry].