Fix pivot.sql

[harmtemolder]

I won’t take any credits, I found this fix in Chris King’s response to your article.

Edit: Also added backticks around function call within the procedure because dashes in my project name seem to break it without them.

PS @fhoffa Could you also provide this function with “EU” as data location?

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[harmtemolder]

@googlebot I signed it!

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[shashnkvats]

@fhoffa can you please provide this function with India (asia-south1) as data location.