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What is NULL? Give an example to described testing for NULL in SQL?
The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:
Person(id, name, address, phone)Now to search ids and names of person who do not have a phone is: Select id, name from Person where phone is null
Explain weak and strong entity sets? Weak and Strong entity sets: A physically powerful entity set has a primary key. All tuples in the group are distinguishable through that k
what is multivalued dependency
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Construct a clean ans concise ER diagram for the database indicating the cardinality mapping for Employee management syatem
Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke
Explanation on Data Sharing?
Design Documentation The Design Document shall be an extension of Requirements Analysis Design. "The Design Document will comprise a revised and much more detailed descrip
In which form of relational database developer refers to a record? In a tuple form of relational database developer refers to a record.
Define what Immediate database modification technique uses? Ans: Both undo and redo.
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