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Why primary key value always not null?
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debanjan sarkar asked Oct 1, 2016
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Gurdeep Saini asked Nov 26, 2018
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To find the total no of substring, why we are not counting null substring 
To find the total no of substring why we are not counting null substring https://stackoverflow.com/questions/12418590/finding-substrings-of-a-string https://gateoverflow.in/2458/gate1994-1-15
To find the total no of substring why we are not counting null substring https://stackoverflow.com/questions/12418590/finding-substrings-of-a-string https://gateoverflow....
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Brij gopal Dixit 1 asked Jul 29, 2018
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Primary KEY
If a primary Key consist of multiple attributes/fields then can it possible that one of the attribute/field have NULL values??? For Example -> If a Relation R(A,B,C) have primary Key as AB then A , B both cannot be NULL but can it possible either A or B have NULL values?
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Sanjay Sharma asked Dec 31, 2016
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Which of the following statement is true? (a) Primary key constraint cannot be disabled, it can only be dropped. (b) Primary key constraint cannot be disabled and dropped. (c) Primary key constraint can be disabled and can be dropped. (d) None of the above
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