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  • itknowledgeexchange.techtarget.com/beyond-excel/… Shows how to use ADO to create a user-defined function (UDF) in Excel Commented May 4, 2012 at 2:22
  • I've managed to get something working, thanks to the link that Tim provided. (See edit) However, it's quite slow when being run on multiple cells. Anyone know how to fix that? Commented May 4, 2012 at 17:18
  • A UDF which runs one cell at a time will never be as fast as running the query via a sub which updates all the cells at once: you're creating, opening and closing a connection every time the UDF recalculates (which could be more than once per sheet/workbook recalculation). You could try caching the connection (and the connection string) in static variables within the function, so if the next call is using the same connection string, you don't have to make a new connection. Never tried that myself though. Commented May 4, 2012 at 18:51