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Objectives
After reading this part, you should be able to:
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
Advantages and disadvantages of icloud based storage
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
Given the following relations Vehicle (Reg_no, make, colour) Person(eno, name, address) Owner(eno, reg_no) Write expressions in the relational algebra to answer the following
What is property - properties of a database ? It is an integrated collection of logically related records. It consolidates separate files into a common pool of data records and
4. Describe three ways to handle missing field values
Which language used in application programs to request data from the DBMS is referred? Language which is used in application program is DML to request data from the DBMS is ref
i need to submit in this topic.
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
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