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What is trigger?
Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
The File Based System File based systems are an early attempt to computerise the manual filing system. For example, a manual file can be set up to hold all the correspondence r
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Two-way Associations Mostly, associations are travel in both directions, although not usually with same frequency. There are three approaches for the implementation. In
What Count function return in SQL? Count function within SQL returns the number of values. (Count function counts all the not null values in the exact column. If we need to cou
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
what is 3nf
WHAT IS DSS? WRITE ITS REQUIREMENTS.
What is a cascading update? Referential integrity constraints needs that foreign key values in one table correspond to primary key values in another. If the value of the primar
Database Administrator One of the main perpose for having the database management system is to have control of both data or programs accessing that data. The person having li
composite attribute
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