> For the complete documentation index, see [llms.txt](https://docs.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.collibra.com/data-quality-self-hosted/core-concepts/explorer/create-a-dq-job/select-columns.md). # Select columns Select the columns to include in your DQ job. {% stepper %} {% step %} Select from the available options.

Column	Description
	The column(s) to include in your DQ Job. Select the checkbox option in the column header to select or deselect all columns, or select each column individually. At least one column must be selected.
Column	The name of the column in your table or view. Click the Assign chip in a Key column to uniquely identify the rows of the column. You can assign only one column as the Key column and it cannot be the column you select for outlier analysis.
Type	The data type of a column. This column is auto-filled and cannot be edited or selected. Collibra DQ supports all standard data types. Collibra DQ also supports custom data types, but this may vary depending on the data source. For more information, see unsupported data types.
Key	Optional. The key column whose rows have unique identifiers. This column provides context by grouping each column by the key column. When detected, breaking records are grouped to their assigned column when assigned. Optionally, click the Assign chip to uniquely identify the rows of a column.
Link ID	Optional. Links the findings of a DQ job back to the source record, or key, for remediation outside of Collibra DQ. The link ID should be unique and is most commonly the primary key. The link IDs are ordered in the same sequence as the columns returned from the data source. Link IDs are required to archive breaking records from Pullup jobs and optional for Pushdown. For more information, go to Working with Link IDs.

{% endstep %} {% step %} If your job uses a data source through a remote file connection, local file, or temp file, then you will see a code preview here. We currently don't support the preview for XML file uploads. {% endstep %} {% step %} Click **Next** to [select your rows](/data-quality-self-hosted/core-concepts/explorer/create-a-dq-job/select-rows.md). {% endstep %} {% endstepper %}