# Merge old tag history with rename new tag history

**URL:** <https://forum.inductiveautomation.com/t/merge-old-tag-history-with-rename-new-tag-history/66157>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [November 5, 2022, 2:16am UTC](https://forum.inductiveautomation.com/t/merge-old-tag-history-with-rename-new-tag-history/66157 "2022-11-05T02:16:32Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![taohongyu88](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@taohongyu88](https://forum.inductiveautomation.com/u/taohongyu88)\
**Post date:** [June 1, 2024, 8:53am UTC](https://forum.inductiveautomation.com/t/merge-old-tag-history-with-rename-new-tag-history/66157/4 "2024-06-01T08:53:19Z")

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> [@nminchin](#):
>
> before executing that UPDATE query  
> Excluding a WHERE clause will re-map _all_ history in that table to your new tag.  
> Using the wrong WHERE clause may have equally catastrophic consequences

I find a new question.  
When I update old tag's tagid to new tag's tagid ;  
PowerChart show this month's history ,but not show the last month's history?

[Power Chart not show the rename tag's last month History? - Ignition - Inductive Automation Forum](https://forum.inductiveautomation.com/t/power-chart-not-show-the-rename-tags-last-month-history/91236)

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