# Duplicate samples in feature tables during merge

**URL:** https://forum.qiime2.org/t/duplicate-samples-in-feature-tables-during-merge/4393
**Category:** User Support
**Created:** [June 1, 2018, 2:23pm UTC](https://forum.qiime2.org/t/duplicate-samples-in-feature-tables-during-merge/4393 "2018-06-01T14:23:03Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Nicholas\_Bokulich](https://forum.qiime2.org/user_avatar/forum.qiime2.org/nicholas_bokulich/32/19937_2.png) [@Nicholas\_Bokulich](https://forum.qiime2.org/u/Nicholas_Bokulich)
#### Post date: [June 1, 2018, 2:55pm UTC](https://forum.qiime2.org/t/duplicate-samples-in-feature-tables-during-merge/4393/2 "2018-06-01T14:55:45Z")

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> [@DADA2 multiple sequencing runs - de novo picking allows for merging after artifact?](https://forum.qiime2.org/t/dada2-multiple-sequencing-runs-de-novo-picking-allows-for-merging-after-artifact/4341/5):
>
> I assume it is because samples in the MiSeq runs have the same title. Which will need to be addressed. How should I go about this? Or when/where should each of these samples be renamed?

You can rename samples in a feature table using [this trick](https://forum.qiime2.org/t/change-sample-ids-after-running-dada2/3918/3). No need to re-do anything.

Another option would be to filter out the Blank samples.

> [@DADA2 multiple sequencing runs - de novo picking allows for merging after artifact?](https://forum.qiime2.org/t/dada2-multiple-sequencing-runs-de-novo-picking-allows-for-merging-after-artifact/4341/5):
>
> Interestingly, I was able to merge the seq.qza files with success:

Because that file just contains feature IDs and sequences, not sample IDs (which cause the issue when merging tables).

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