can you think of ways to validate the information from SQL queries or reports, to assure a level of accuracy in the results?

In 400-500 words, can you think of ways to validate the information from SQL queries or reports, to assure a level of accuracy in the results? When, if at all, is it better to extract raw data instead of summary information and what are the best ways to present any retrieved information (e.g., tables, diagrams, narrative)?
Plagiarism must be less than 10%.
Include permalink on the refernces