# Flag invalid rows[¶](https://doc.dataiku.com/dss/latest/preparation/processors/flag-on-meaning.html#flag-invalid-rows "Permalink to this headline")

This processor flags rows with invalid values, ie values not matching a selected meaning.

It creates a column which will contain ‘1’ if the row matches (invalid), nothing else

## Columns selection[¶](https://doc.dataiku.com/dss/latest/preparation/processors/flag-on-meaning.html#columns-selection "Permalink to this headline")

This processor can check its matching condition on multiple columns:

* A single column

* An explicit list of columns

* All columns matching a given pattern

* All columns

You can select whether the row will be considered as matching if:

* All columns are matching

* Or, at least one column is matching
