Extract and write down the DB Schema for the following E-R Diagram. You need to write the name, attributes, and keys (need to be underlined) for each relation in your schema code result Exam sin description pfname (0, N) (0, N) Patient UnderTakes cot plname (0, N) sex start_date end date (1, N) (0, N) HostedBy doctorld start date tel office (1, 1) (1, N) rooms Doctor Worksin Clinic cname dfname diname (1, 1) Manages (1, 1) specialty

Q: What are three indications that a surrogate key should be constructed for the primary key of a…

A: Surrogate key is unique key and also called as synthetic primary key. Surrogate key holds anonymous…

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A: A company's Contacts table may store supplier names, e-mails, and phone numbers.Because other…

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A: SOLUTION -From the above Entity Relationship Diagram, we can identify three tables. They are1)…

Q: re three reasons why the main key of a relation has to be replaced with a surrogate key?

A: Here are three reasons why the main key of a relation has to be replaced with a surrogate key.

Q: Computer science What is the relationship between the primary key of a relation and the…

A: The Answer is in step2

Q: hen creating subtype associations, it is important to consider the database table possibilities…

A: Given When creating subtype associations, it is important to consider the database table…

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A: Denormalization is a performance-enhancing method that is applied to a previously normalized…

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A: The Answer is

Q: Describe the differences in meaning between the terms relation and relation schema.

A: A relation schema is the combination of list of attributes and their related domain types. An…

Q: What are three reasons why the main key of a relation need to be replaced with a surrogate key?

A: substitute key: It is a key that has no contextual significance but is utilised in data analysis to…

Q: It is essential to discuss the various database table possibilities when dealing with subtype…

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A: The following is just how the ER diagram is mapped to the relational schema:- Step-1:- Mappings of…

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A: A primary key is an attribute that identifies a record in a database. It is used to filter data…

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A: The connection between the main key of a relation and the functional dependencies among all…

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A: There is only one error in the above code and that is the ALTER TABLE command on the address table.…

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A: There are a few conditions under which the database designer should employ supertype and subtype…

Q: [1] carRepair.dia 00.00 date description 1 techID techName mentor Mentors supID supName Supervisor N…

A: Solution:

Q: Explain the usage of attributes and the generic name for attribute in the relationship mode

A: I have provided answer in step2

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A: To be determine: Write the three situations that suggest relations be denormalized before database…

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Q: The conditions under which the database designer should employ supertype and subtype connections are…

A: The answer for above question is given in the below step

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A:

Q: The conditions under which the database designer should employ supertype and subtype connections are…

A: Definition: A kind of generic entity that is connected to one or more sub-types is known as a…

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A: Here from the given diagram we can observe the below 1) There are three entities.                 a)…

Q: What are three cases when a surrogate key might be used in place of a relation's main key?

A: A surrogate key is an artificially generated or assigned unique identifier that is used to uniquely…

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A: requirements for suggesting a substitute key There are three circumstances that indicate a…

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A: Denormalization means it is a process adding one or more redundant data to one or more tables. The…