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List the requirements needed to design a trigger. The requirements are:- Specifying when a trigger is to be implemented. State the actions to be taken when the trigger im
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
Operator Precedence The basic operators used in SQL are * / - + Operators of the similar priority are evaluated From Left to right Parentheses are used to force priorit
What is meant by object identifiers? Object-oriented systems use an object identifier to recognize objects. Object identifiers are unique: that is every object has a single ide
Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas
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 correlation in nested query
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
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