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Explain P command in the respect of QBE?
P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is written. To shown the whole relation, P has to be written in each field or through placing a single P in the column headed through the relation name also displays entire relation.
Define in which normalisation form if an attribute of a composite key is dependent on an attribute of other composite key. Ans: 3NF A relation is in 3 NF if an attribute of
Benefits of Hashed file Organisation 1. Insertion or search on hash-key is quick. 2. Best if equality search is required on hash-key. Drawbacks of Hashed file
An example of a weak entity is Staff because the availabilityID cannot be uniquely identified unless it is used in conjunction with the foreign key known as availabilityID in the A
Which method of access uses key transformation? A Hash method of access uses key transformation.
SET concept is used in which type of modelling? SET concept is used in Network Model.
Describe sequential file organization. Explain the rules for (i) Inserting a new record. (ii) Deleting an existing record. Ans:A sequential f
Describe an data dictionary? A data dictionary is a data structure which keeps meta data about the structure of the database ie. the schema of the database.
Normal 0 false false false EN-IN X-NONE X-NONE
Use Delegation to Share Implementation The delegation " Delegation comprises of catching an operation on one object and sending it to other object which is part, or related to
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
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