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Describe the Composite Key Composite Key: Sometimes one key is not enough to uniquely recognize a row. E.g. in a single class Roll is enough to search a student, but in the w
examples of fields in a database
Define query language? A query is a statement requesting the retrieval of information. The portion of DML that includes information retrieval is known as a query language.
In which relational modes, cardinality is termed? Answer : Cardinality is termed in a number of tuples relational modes.
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
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
Define granularity, hierarchy of granularity of locks & multiple granularity locking. Explain the modified two phase locking along with multiple granularity locking. Ans: The s
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