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Define the terms i) Key attribute ii) Value set
Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Such an attribute is known as a key attribute.
Value set: Each easy attribute of an entity type is associated with a value set that states the set of values that might be assigned to that attribute for every individual entity.
The Transactions- A transaction is definite as the unit of work in a database system. Database systems that deal with a huge number of transactions are also termed as transaction p
Multilevel Index The Multilevel Index is a modification of the secondary level index system. In this system we might be use even more number of levels in case the table is eve
Difference between LEFT OUTER JOIN and RIGHT OUTER JOIN In left outer join tuples from the left-hand-side relation which do not match any tuple in the right-hand-side relation
Explain Dynamic Two-Phase Locking Here a transaction locks a data item instantly earlier than any operation is applied on the data item. After finishing all the operations on
What is Foreign Key Foreign Key: Sometimes we may have to work with an attribute that does not have a primary key of its own. To recognize its rows, we have to use the primar
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
Briefly describe the different kinds of users of a DBMS. Ans: Different sorts of DBMS users are: (a) Software Engineers: These are the people accountable for developing ap
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
Explain Candidate Key and Super Key A super key is a set of one or more than attributes that, taken collectively, permits us to identify uniquely a tuple in the relation. Wher
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
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