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One-way Associations
If an association is only traversed in single direction, then it is known as one-way association. It is implemented as a pointer or an attribute which contains the object reference. If the multiplicity is "one", as in Figure, then it is a easy pointer; otherwise, if the multiplicity is "many", then it is a group of pointers. If "many" end is ordered, then a list may be used, instead of a set. A qualified association with multiplicity "one" could be implemented as a dictionary object.
Implementation of two-way association using pointers
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
Consider the ER schema below for the MoneyMaking supermarket chain problem. Translate the given ER schema into SQL CREATE TABLE statement.
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What is NULL? Simply NULL means not in value.
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a project based on normalization with first, second and third normalization. There need to be a diagram also
NEED ER DIAGRAM WITH MINIMUM ENTITY AND RELATIONSHIP of Hospital Management System
Nested Queries Let us see some more complex queries in this section. Sub-queries: Some of the basic concerns of sub-queries are: A sub-query is a SELECT statemen
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