I need to create a page that will query external sql data and display the result on that page.
Also any user can edit the data and will automatically update the external sql database/.
Is there already such available extension ?
Topic on Project:Village Pump
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Also, MediaWiki is a documentation system, not a CRUD. There's no such extension, but if you have knowledge of PHP you may he able to come up with something to do that. A CRUD is something very specific (database, table, fields to update, layout, etc) that I would be surprised to find anything ready to use.
The Cargo extension could perhaps be what you're looking for. It can be used to query data in a database, and to write to it. I'm not sure how it goes doing both at once—you might have to first import your data into your wiki, if you want to be able to update it from the wiki.