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This template is used in system messages, and on approximately 3,940,000 pages, or roughly 6% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage .
Templates used for "if-then-else" (i.e. conditional) types of queries within Wikipedia code. Take care! These templates can be tricky to manipulate and can produce unexpected results, especially if their use is introduced or amended without testing.
This template can only be edited by administrators because it is transcluded onto one or more cascade-protected pages. With this template the parser functions of the ParserFunctions collection with names starting with "#if" can be used in a way such that they do not strip spaces and newlines from the "then" and "else" part.
Behind the scenes, it is this statement that is actually executed. A suitably comprehensive front-end can minimize the burden on the user to remember the finer details of SQL, and it is easier and more productive for end-users (and even programmers) to select tables and columns by selecting them rather than typing in their names.
This template is used on approximately 6,900 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage . Consider discussing changes on the talk page before implementing them.
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This template can only be edited by administrators because it is transcluded onto one or more cascade-protected pages. With this template the parser functions of the ParserFunctions collection with names starting with "#if" can be used in a way such that they do not strip spaces and newlines from the "then" and "else" part.
See also: the {{}} template. The #if function selects one of two alternatives based on the truth value of a test string. {{#if: test string | value if true | value if false}} As explained above, a string is considered true if it contains at least one non-whitespace character.