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Union-InDB tool Error: Data Stream Out (8): Error opening SELECT is_primary, phone

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I am relatively new to Alteryx and working on solution whose illustration is attached. Basically, I am extracting data from two different tables, moulding them respective query to form a same format. Then I m using union In-DB tool to combine the result but I am getting captioned error. Interestingly, error is appearing not on union In-Db but any tool I use to look into result i.e. Browser In-DB or Data out-stream. I have used simple union tool by taking both of the same data extraction outside of server (as option 2 captioned container in snap). This solution is working fine. Not sure what I am doing wrong. I am using Alteryx designer 2018.4. Need help?




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