# Options

![Options for Merge rows (diff)](/files/x5vMlcvbQ5cPN3R1TkDZ)

The Merge rows (diff) step contains the following options.

| Option                    | Description                                                                                                                                                           |
| ------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Reference rows origin** | From the drop-down list, select the input source for the original reference rows you want to compare. The input source will be a previous step in the transformation. |
| **Compare rows origin**   | From the drop-down list, select the input source for the compare rows. The input source will be a previous step in the transformation.                                |
| **Flag fieldname**        | Specify a field name that will contain the flag indicating how the values were compared and merged in the output row.                                                 |
| **Keys to match**         | Specify the field names that contain the keys on which to generate a match.                                                                                           |
| **Values to compare**     | Specify the field names that contain the values on which to generate a comparison.                                                                                    |
| **Get key fields**        | Click the **Get key fields** button to populate the **Keys to match** table with all the fields in the **Reference rows origin** step.                                |
| **Get value fields**      | Click the **Get value fields** button to populate the **Values to compare** table with all the fields in the **Compare rows origin** step.                            |


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