Which of the following is NOT typically part of a data quality rule?

• A. Null checks
• B. Range checks
• C. Uniqueness checks
• D. Color coding of UI

Answer: (D)

Data quality rules are validations that ensure data integrity, focusing on making sure data is complete, valid, and consistent. Null checks enforce that required fields actually have values. Range checks keep numeric or date fields within acceptable bounds to catch mistakes or outliers. Uniqueness checks ensure that identifiers or keys do not repeat where uniqueness is required. Color coding of the UI, however, is a presentation technique used to visualize information or highlight issues within dashboards or forms. It does not by itself validate or enforce data values; it only aids users in spotting problems. So color coding of the UI isn’t a data quality rule.