- Inside the Alteryx workflow designer, head over to the left-side panel and find 'Union'. Drag it to the canvas for further customization.
- Following that, go to the Join tool and connect its corresponding L Output Anchor to the Input Anchor of the Union Tool.
- Do the same thing for the J Output Anchor of the Join tool.
- Once done, click the 'Union' tool.
- Go to the right-hand panel afterwards, then configure the settings based on your preference.
- Finally, the selected data in your Alteryx workflow will be processed using the Left Join tool.
How to Do a Left Join in Alteryx
Try this interactive demo to learn how to do a left join in Alteryx.
📌 Why this matters
Left joins let you combine datasets while preserving all records from your primary table, even when matching records don't exist in the secondary table. This prevents accidental data loss during merges and maintains your original dataset's integrity. Beyond simple data combination, left joins reveal gaps in your data relationships - showing you exactly which primary records lack corresponding matches. This insight helps identify missing customers, incomplete orders, or data quality issues that could skew your analysis if left unaddressed.
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