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Troubleshooting: SSIS error 0x00084005 “the parameter type cannot be deduced because a single expression contains two untyped parameters @x and @P1”

This is one scary looking error message:

SSIS error 0x00084005 “the parameter type cannot be deduced because a single expression contains two untyped parameters @x and @P1”

It’s terrifying enough to make you think maybe you should quit your SSIS development career altogether. But wait… What’s this? Perhaps you’re getting this message for the same bone-headed reason I was. In my case a better error message would have been:

SSIS error 0x00084005 “Hey, you forgot to declare your variables in the SELECT┬ástatement”

Whoops! Looks like cut and paste was the problem ­čÖé Here’s to hoping all your problems are as easy to solve as this!

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