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difference between MIS and DSS
External failure : A failure can also result because of an external cause, such as earthquakes, fire, floods, etc. The database must be duly backed up to avoid troubles occurring d
What is conceptual model ? A conceptual model is a independent of both hardware and software.
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
entity relationship diagram for online examination system
Which database level is closest to the users? External database level is closest to the users.
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Give an example of Operations from the functions of a bank. For creation of a saving account, you can write: bank::: create -savings-account (customer)->account. For oper
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
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