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elixir/unique-indexes-with-ecto.md
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# Unique Indexes With Ecto # Unique Indexes With Ecto
You can create a unique index in a migration for one or more columns using You can create a unique index in a migration for one or more columns using
the [`unique_index/3`] function. the
[`unique_index/3`](https://hexdocs.pm/ecto/Ecto.Migration.html#unique_index/3)
function.
For example, if you are creating a join table for `followers` and want to For example, if you are creating a join table for `followers` and want to
ensure that duplicate _follower_ entries are prevented, you may want to ensure that duplicate _follower_ entries are prevented, you may want to