Question 9 nag     .What happens when you try to look up a value and the key does not exist in the map?  Full explain this question and text typing work only      We should answer our question within 2 hours takes more time then we will reduce Rating Dont ignore this line

Q: What happens when you add two entries to a map with the same value and two different keys?

A: Add  twо  entries  tо  а  mар  with  the  sаme  vаlue  аnd  twо  different  keys

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Q: If the key is not there in the map and you attempt to look up a value, what will happen?

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Q: User research allows you to divide up the design into many user views.

A: The answer for the above question is given in the following step for your reference.

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Q: Is there a penalty for adding a new key-value combination to an existing map entry?

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Concepts in Designing Database

A database design is the process of data organization based on a database model. The process deals with identifying what data should be stored in a database and how data elements relate to each other.

Entity Relationship Diagram

Complex real-world applications call for large volumes of data. Therefore, it is necessary to build a great database to store data safely and coherently. The ER data model aids in the process of database design. It helps outline the structure of an organization’s database by understanding the real-world interactions of objects related to the data. For example, if a school is tasked to store student information, then analyzing the correlation between the students, subjects, and teachers would help identify how the data needs to be stored.