# \#primary-key

**URL:** https://community.omni.co/tag/primary-key/5.md

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## [Why am I getting the error: “Joins fan out the data without a primary key”?](https://community.omni.co/t/why-am-i-getting-the-error-joins-fan-out-the-data-without-a-primary-key/37)

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**Author:** [@conner](https://community.omni.co/u/conner)\
**Replies:** 0\
**Last updated:** [April 10, 2024, 11:51pm UTC](https://community.omni.co/t/why-am-i-getting-the-error-joins-fan-out-the-data-without-a-primary-key/37 "2024-04-10T23:51:15Z")

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How to fix the error If you define your table’s primary key, that should resolve the error! A table’s primary key is a column that contains a unique identifier per row — usually, it’s an ID column. There are 2 ways to …