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What is the difference between a key and a superkey?
Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one or more examples (rows) of the set (table). It is a minimal combination of attributes.
Super Key - A super key is a set of one or more attributes in which, taken collectively, permits us to identify uniquely a tuple within the relation.
Locks: Serialisabilty is just a test whether a given interleaved schedule is ok or has a concurrency related trouble. Though, it does not make sure that the interleaved concurrent
normal forms
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
what is primary key
Why is need for the multiple access paths?
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
Question: (a) Can a set of data requirements be correctly modelled by two or more different ER diagrams? Explain your answer. You may use a small example, if you think it will
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