> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ExternalColumn.isin()

<span id="atoti.ExternalColumn.isin" />

> @overload<br />
> ExternalColumn.isin(<br />
>     *\*elements*: Constant,<br />
> ) → MembershipCondition\[ExternalColumnIdentifier, 'IN', Constant] | RelationalCondition\[ExternalColumnIdentifier, 'EQ', Constant]

> @overload<br />
> ExternalColumn.isin(<br />
>     *\*elements*: Constant | [None](https://docs.python.org/3/library/constants.html#None),<br />
> ) → MembershipCondition\[ExternalColumnIdentifier, 'IN', Constant | [None](https://docs.python.org/3/library/constants.html#None)] | RelationalCondition\[ExternalColumnIdentifier, 'EQ', Constant | [None](https://docs.python.org/3/library/constants.html#None)]

Return a condition evaluating to `True` for elements of this column included in the given *elements*, and evaluating to `False` elsewhere.

### Parameters

<h4 id="atoti.ExternalColumn.isin.elements">
  *\*elements*
</h4>

One or more values that the column elements will be compared against.