What is the ouput of the following query,
SELECT COUNT(managerId) FROM Employee

empId Name managerId
789 select 45
356 update NULL
698 delete 78

 Posted by Kmandapalli on 2/4/2014 | Category: Sql Server Interview questions | Views: 2029 | Points: 40

The output will be 2.
Because even though we have three rows but a single row does not contain managerId which means it contains NULL value.
Since the COUNT statement does not allow NULLS, the output is 2.

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