Issue with Sending Table Data and Column Mapping Solutions

Ivan D. · 2026-01-06T03:52:21.050Z

Write to other table function is not working anymore, right? Then if i want to get data from one table to another, when i try to do it with "send table data" - I cannot map to already existing columns because they will be overwritten. How can i solve this issue?

Issue with Sending Table Data and Column Mapping Solutions | Clay

Muhammad S.
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Muhammad S.
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you can map the new fields from send data table to the existing fields in other table after sending
Clay Support
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You're right that "Write to Other Table" is deprecated as of December 2025, but existing actions still work. [1]
For "Send table data," you can actually map to existing columns without overwriting them. Here's how:
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After sending data, click into the source cell in your destination table
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Hover over the field you want to map
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Click "Add to column"
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Choose "Map to existing column" instead of creating a new one [2]
This lets you update existing columns rather than overwrite them. The lookup function is another option, but Send table data can handle existing column mapping too.
Clay Support
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Is that what you were looking for?
Clay Support
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"Write to Other Table" is deprecated but still works for existing columns - you just can't create new ones.
For your mapping issue with "Send table data": when data arrives in the destination table, it creates a source column first. You then map from that source column to existing columns by clicking into the source cell, hovering over the field, and selecting "Map to existing column". [1] This way you're not overwriting - you're mapping from the source column to your existing ones.
The lookup function works too, but the mapping approach with Send table data should solve your issue without overwriting existing columns.
Clay Support
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Is that what you were looking for?
Clay Support
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If you still need help with mapping data between tables or have any other questions about these functions, I’m here to assist. Would you like to provide more details about what you’re trying to achieve so I can support you further?
Ivan D.
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If i try to map to existing columns it shows an error saying that the existing values will be overwritten
Clay Support
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You're seeing that warning because mapping to existing columns will indeed overwrite the current values in those columns. [1] This is the expected behavior when you choose "Map to existing column" - it replaces whatever data is already there. [2]
If you want to preserve existing data, you'll need to create new columns instead of mapping to existing ones. When you hover over a field and click "Add to column", choose "Create column" rather than "Map to existing column".
The lookup function you mentioned earlier is actually the better approach if you want to update existing columns without overwriting all the data.
Clay Support
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Did that answer your question?
Ivan D.
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And this is strange, because the other day i did the exact same thing but it worked well - not sure what's different now
Clay Support
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The behavior you're experiencing is actually correct - mapping to existing columns has always been designed to overwrite existing values. [1] This is the expected functionality and hasn't changed.
What might have happened "the other day" is that you either:
Created new columns instead of mapping to existing ones
Used a different method like lookup functions
The destination columns were empty, so the overwrite wasn't noticeable
The warning about overwriting existing values is there to prevent accidental data loss - it's working as intended to protect your data. [2]
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Was this helpful?
Ivan D.
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Clay S. no - you're contradicting yourself.
Clay Support
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I understand this is frustrating, so I’ll connect you with a human agent who can help clarify this further.

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