Manual:SQL patch file

You might write an SQL file either for a schema change in the core (see policy>Special:MyLanguage/Development_policy#Database_patches|Development_policy#Database_patches, ) or for an extension (see ). See also the conventions>Special:MyLanguage/Manual:Coding conventions/Database|general database coding conventions.

Example
An SQL file to create a table might look something like this:

Variable replacement
  will be replaced with .

  will be replaced with an index prefix.

  will be replaced with the value of .

The first two need to be used in patch files, as in the example above.

<tvar|1> </> is only used for <tvar|2></> database backends.

There are other variable replacements but they are not used in practice.

See the documentation of <tvar|replaceVars>Database::replaceVars</> for the full list.