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For each 1: n relationship type R involving two entities E1 and E2, we recognize the entity type (say E1) at the n-side of the relationship type R and contain primary key of the entity on the other side of the relation (say E2) as a foreign key attribute in the table of E1. We contain all easy attributes (or easy components of a composite attributes of R (if any) in the table of E1).
For example, the works_in relationship among the DEPARTMENT and FACULTY.
For this relationship choose the entity at N side, i.e., FACULTY and add primary key attribute of one more entity DEPARTMENT, i.e., DNO as a foreign key attribute in FACULTY.
FACULTY (CONTAINS WORKS_IN RELATIONSHIP
ID
NAME
ADDRESS
BASIC_SAL
DNO
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
A full discription of the new, a discription of its components, and the bebefit it will provide a company. A disscussion of the information usedin the system. A disscussion of any
CREATE TABLE prodtrans ( pno number (4) ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5) FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);
What are the advantages and disadvantages of merging an association into a class? Advantages: i) Less number of tables ii) Faster performance due to the fewer tables
growing phase and shrinking phase are disjoint, why ?
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What are the causes of bucket overflow in a hash file organization? What can be done to reduce the occurrence of bucket overflow? When a record is inserted, the bucket to that
Describe domain constraints. Domain constraints contain entity integrity and referential integrity. The domain is a set of values that might be assigned to an attribute. The en
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Explain about primary key Primary Key: It is one of the candidate keys that are taken to be the recognizing key for the entire table. E.g. although there are two candidate ke
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