Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
What are the advantages of relational data model?
Advantages• Ease of use - The revision of any information as tables consisting of rows and columns is quite natural and thus even first time users search it attractive.
• Flexibility - Various tables from that information has to be linked and extracted can be simply manipulated through operators such as project and join to provide information in the form in that it is desired.
• Security - Security control and authorization could also be implemented more easily through moving sensitive attributes within a given table into a separate relation along with its own authorization controls. If authorization needs permits, a particular attribute could be joined back along with others to enable full information retrieval.
• Data Independence - Data independence is achieved more simply along with normalization structure used in a relational database than in the more complex tree or network structure. It also frees the users from details of storage structure and access techniques.
• Data Manipulation Language - The possibility of responding to ad-hoc query through means of a language based on relational algebra and relational calculus is simple in the relational database approach. Gives simplicity in the data organization and the availability of reasonably easy to extremely powerful query languages.
Due date for May 8
i need to implememnt a treee based mining algorithm. do you have an expert that can do that?
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
Write an sql statement to find what is the percentage of home policies which are from the state of Arizona out of all Home policies by Policy Value.
XYZ is a large chain of home entertainment rental over 100 stores distributed over all states in Australia. XYZ lends entertainment products such as movies, TV shows and games on v
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
Control as Concurrent Tasks The expression control as simultaneous task means applying control for those events of object which can happen simultaneously. An object can be imp
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
Describe the functions and features of foreign key? Foreign Key : The primary key of one file or table that is implanted in another file or table to implement the relationships
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd