Data Remediation with ONE Data

For the purpose of this guide, we’re using a table containing information about the people who attended the company’s events in the past year. The table has the following attributes: firstname, lastname, email, company, job_title, country, attendance_type, registration_date, is_active. After initial DQ evaluation, several attributes are flagged.

We’ll start by importing invalid records to ONE Data. In the three dots menu, select Export > Export to ONE Data and then as Export type choose Full (data with DQ results) and Invalid records.

Modify the table metadata as needed and select Create table. For more detailed instructions, see Import Data from a Catalog Item.

Once the import finishes, find your new table in ONE Data.

Here, we’ll focus first on the email attribute. To quickly get an overview of the issues we’re dealing with, we can add a DQ filter that searches for all invalid records in this attribute.

To do this, right-click the attribute and select Filter. Set the expression to failed and in DQ rules choose Select All (dimensions).

Based on the DQ rules available for the business term email (String completeness and validation E-mail), this means that the invalid records in this attribute are either null or contain incorrect values.

Check the filtered records to see whether there is anything you can fix on the spot. For example, if there are values such as Florian11hotmail.com or Joel45@yahoo . com, you can add the missing at sign (@) or remove the extra space characters respectively. The changes are automatically saved, the DQ warning is removed, and the list of filtered records is updated. The DQ results remain the same until you recalculate them.

To remediate the null records, you might need to ask a coworker for assistance as additional data collection or verification might be required. Here, you can create a new assignee attribute of type User in the table and assign the invalid records to a coworker. For more details, see Get Started with ONE Data, section User data type.

The quickest way to do this is by updating the filter to search only for records that failed String Completeness rule. Next, select all filtered records, then right-click the assignee attribute and choose Bulk edit. Select a user from the list and then Edit n records.

In some cases, it might be less obvious what the reported problem is. For example, if we take a look at the country attribute and see that values such as Canada, France, or US-NY were flagged as invalid, it’s worth further investigating which DQ rules are applied.

On the attribute details page, we can see that both Country and ISO-3 Country Code terms are assigned to the attribute and that one of the rules mapped to the ISO-3 Country Code term verifies whether the value is exactly three characters long. Therefore, all values with more than three characters are considered invalid.

Depending on which information you prefer to keep, you can opt to edit invalid values to comply with the ISO-3 country codes or remove the term ISO-3 Country Code from the attribute.

If you choose to edit the values, combine DQ and other filters to find the affected records before you start editing. Next, select all filtered records with the same country name and edit them at once using the Bulk edit option.

If you prefer to remove the business term, after it is unassigned, you need to publish the changes and run DQ evaluation again (Evaluate Data Quality).

Finally, check the remaining invalid values. In our case, these are US-NY and US-MA. They are not included in the reference data used for the country name validation rule and can both be updated to USA.

Once again, you can filter records by country name and use the Bulk edit option to update all affected records at once.

After the update, run DQ evaluation once more: the country attribute no longer contains any invalid records.

Once you’re happy with the state of your data, you can export it back to the origin source using the Export feature. Open your table either from the Knowledge Catalog or ONE Data, then in the three dots menu select Export > Export to database.

Select which attributes you want to export and find the target table where records will be exported to. You can choose whether to overwrite the existing table or create a new one.

For more information about how to configure and run the export project, see Data Export.