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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.
Describe sequential file organization. Explain the rules for (i) Inserting a new record. (ii) Deleting an existing record. Ans:A sequential f
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
as a customer service employee explain five measures you would recommend to make even a displeased students patronize the school canteen
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Explain concurrency control? Concurrency control Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read
Data Manipulation Language Data manipulation language (DML) describes a set of commands that are used to query and change data within existing schema objects. In this case comm
What are the uses of functional dependencies? To test relations to see whether they are legal under a given set of functional dependencies. To state constraints on the set
4. Describe three ways to handle missing field values
Determine the OBJECTIVES of object design After passing through this unit, you should be able to: describe and apply concept of generalisation; understand and appl
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