Computers and Technology, 10.03.2020 03:53 saintsfan2004

1. Discuss attribute semantics as an informal measure of goodness for a rela- tion schema.
2. Discuss insertion, deletion, and modification anomalies. Why are they considered bad? Illustrate with examples.

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Tables that does not have a complete data may encounter problems called update anomalies, which have different categories like insertion, deletion, or modification anomalies

Explanation:

When attributes are intertwined together they form a relationship, it is believed that attributes that have one to one relation have a proper interpretation and better meaning which are assumed to be associated by them . The semantics of a relation is defined as the the exposition of value attribute in a tuple. That is to say a better way of the explanation of a relations attributes is a measure of informal well known relation designed.Tables that does not have a complete data may encounter problems called update anomalies, which have different categories like insertion, deletion, or modification anomalies. For example of a table with on useful data data called EMP-Department. There are two categories of insertion anomalies, For this method to be useful for the detail of a new employee in Emp-Department, we must add either value attribute for the department that the employee is engaged in or void. For the second method , an the attribute value must be entered for the department 2 well so that there will be a consistent value for department number 5 in other field in EMP-Department. When a department does not have a new employee It is difficult to insert the department value

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As computers and other digital devices have become essential to business and commerce, they have also increasingly become a target for attacks. in order for a company or an individual to use a computing device with confidence, they must first be assured that the device is not compromised in any way and that all communications will be secure

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the answers b, i just took the quiz on e2020

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1. Discuss attribute semantics as an informal measure of goodness for a rela- tion schema.
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