# tAddCRCRow

Provides a unique ID which helps improving the quality of processed data. CRC stands for Cyclical Redundancy Checking.

tAddCRCRow calculates a surrogate key based on one or several columns and adds it to the defined schema.

For more technologies supported by Talend, see [Talend components](https://help.qlik.com/talend/r/en-US/7.3/components/identification).

### In this section

* [tAddCRCRow Standard properties](https://help.qlik.com/talend/en-US/components/7.3/identification/taddcrcrow-standard-properties)

**Related concepts**

[Adding a surrogate key to a file](https://help.qlik.com/talend/en-US/components/7.3/identification/taddcrcrow-tfileinputdelimited-tlogrow-tlogrow-adding-surrogate-key-to-file-standard-component-this)