Discussion
Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?
Answer: B
Correct answer: Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
All three rows describe the same thing but no two strings match, so grouping, counting and joining on the column all give wrong answers. It arises wherever free text is entered without a controlled vocabulary, and the remedy is to constrain the values - by a lookup table or a check constraint - rather than to clean them repeatedly.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development