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What is conceptual schema?
The schemas at the view level are known as subschema that describe dissimilar views of the database.
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
What is Cross Product? Simply Cross product is Binary Operator
Define the concept of generalization A generalization is relationship between specific kind of thing and general thing. It is also known as "is-a-kind-of" relationship. Inher
The JOIN operation is applied on two relations. When we want to choose related tuples from two given relation join is used. The join operation need that both the joined relations m
Benefits of Sequential File Organisation It is quick and efficient when dealing with huge volumes of data that require being processed periodically (batch system). Dra
Using Relational Algebra which query finds customers, who have a balance of over 1000 ? Using Relational Algebra Π Customer_name( σ balance >1000(Deposit)) is query to find cu
Ask questiwhat is row indicator in database on #Minimum 100 words accepted#
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
What is self-transition? If there is a transition which goes back to same state, it is known as "self- transition." With a trigger action exit action would be executed f
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
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