Basic concepts questions

A probability refers to the percentage chance that something will happen, from 0 it is impossible to 1 it is certain to occurand the scale going from less likely to more likely. Probability concepts help define risk by quantifying the prospects for unintended and negative outcomes; thus probability concepts are a major focus of the CFA curriculum.

Basic concepts questions

How is the Basic concepts questions structure of System R different from the relational structure? Unlike Relational systems in System R Domains are not supported Enforcement of candidate key uniqueness is optional Enforcement of entity integrity is optional Referential integrity is not enforced What is Data Independence?

Data independence means that the application is independent of the storage structure and access strategy of data. In other words, The ability to modify the schema definition in one level should not affect the schema definition in the next higher level.

Two types of Data Independence are: Modification in physical level should not affect the logical level. Modification in logical level should affect the view level. Logical Data Independence is more difficult to achieve. What is a view? How is it related to data independence?

A view may be thought of as a virtual table, that is, a table that does not really exist in its own right but is instead derived from one or more underlying base table.

In other words, there is no stored file that directly represents the view instead a definition of the view is stored in data dictionary. Growth and restructuring of base tables are not reflected in views.

Basic concepts questions

Thus the view can insulate users from the effects of restructuring and growth in the database. Hence accounts for logical data independence. What is Data Model? A collection of conceptual tools for describing data, data relationships data semantics and constraints.

What is E-R model? E-R model stands for the Entity-Relationship model. This data model is based on a real world that consists of basic objects called entities and of the relationship among these objects.

Entities are described in a database by a set of attributes. What is Object Oriented model? This model is based on a collection of objects. An object contains values stored in instance variables within the object. An object also contains bodies of code that operate on the object.

These bodies of code are called methods. Objects that contain same types of values and the same methods are grouped together into classes.You could measure its mass and volume to compare its density with water's density.

Once it is confirmed it's water, you could measure its boiling or freezing point and compare it with water's; a lower freezing point or a higher boiling point means there is salt dissolved in the water. There are step-by-step procedures in your Basic Nursing textbook that correspond with the exercises that you can refer back to for additional reading, however to answer these questions you must watch the associated referenced video from the all-new Davis’s Nursing Skills Videos to get the answers.

About Pew Research Center Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world.

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Practice Questions: Basic Concepts