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Updating Views with INSTEAD OF Triggers

Chad Callihan performs sleight of hand:

I ran into a strange issue recently and thought it would make for a great blog post. I was notified of a standard application process failing with the following SQL error:

Msg 4405, Level 16, State 1, Line 19
View or function ‘XXXXX’ is not updatable because the modification affects multiple base tables.

I recognized the error but was baffled as to why it was showing up in this particular area. I’d updated or modified this view plenty of times in the past so what’s going on?

Read on for the answer.

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