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SQL PUZZLE | Output of SELECT COUNT(NULL) / SELECT COUNT(0) / SELECT COUNT($) ?? | SQL INTERVIEW QUESTION
In this puzzle you have to provide the output of below statements and back them with the reasons. For more details please refer statements below-
–Q1. What will be the output of SELECT COUNT(NULL)
-- SELECT COUNT(NULL) -- |
OUTPUT
|
Msg 8117, Level 16, State 1, Line 2 Error clearly says that you cannot use NULL in Count function. |
–Q2. What will be the output of SELECT COUNT(0)
-- SELECT COUNT(0) -- |
OUTPUT
|
The output will be 1 here. |
–Q3. What will be the output of SELECT COUNT($)
-- SELECT COUNT($) -- |
OUTPUT
|
The output will be 1 here. Apart from NULL you will always get 1 |
Add your solution(s) in the comments section or send you solution(s) to pawankkmr@gmail.com
Add a comment if you have any solution in mind. I would love to learn it. We all need to learn.
Pawan Khowal
Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.
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