Discussion
The SQL statement: SELECT Name, COUNT(*) FROM NAME_TABLE; counts the number of name rows and displays this total in a table with a single row and a single column.
Answer: B
Correct answer: False
The statement mixes an ungrouped column with an aggregate. Name has one value per row while COUNT(*) has one value for the whole table, and there is no rule for pairing them.
Standard SQL rejects the query, and so do most engines in their default configuration. Either drop the column, giving SELECT COUNT(*) FROM NAME_TABLE and a single row, or add GROUP BY Name, giving one row per distinct name with its own count - but not the single row the statement describes.
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