One of the most frequently posed Business Intelligence Interview Questions, be ready for it. Quality data should be accurate, unique, error-free, and consistent. Here are some checks you can perform:  Accurately capture all conditions and compliances.  Cleanse and validate the data. Keep track of all the changes made to the data.  Remove duplicate data and irrelevant columns from the database.  Maintain data integrity by updating it regularly.  The data should be in a consistent format so that it is easy to analyze.