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NISA [10]
3 years ago
12

Technician A says that the last step in the diagnostic process is to verify the problem. Technician B says that the second step

is to perform a thorough visual inspection. Who is correct?
A. Technician A
B. Both Technicians A and B
C. Neither Technician A nor B
D. Technician B
Computers and Technology
1 answer:
andreev551 [17]3 years ago
3 0

the answer is A you're welcome

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Consider the following schema for customer: (id, name, street, city, state, zip, phone), in which customers are uniquely determi
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Answer:

Super key is a set of attributes that uniquely identifies all attributes in a relation.Super keys are more than candidate key.

Explanation:

For example in the given schema where

Customer: (id , name , street , city,state,zip,phone)

We have a relation we check super keys by following dependencies

Functional Dependencies                          Super Key

id                                                                     YES

name                                                               YES

id , name -> street , city,state,zip,phone       YES

id , street  ->name , city,state,zip,phone       YES

id,city ->name , street ,state,zip,phone         YES

id,state ->name , street ,city,zip,phone         YES

id,phone  ->name , street ,state,zip,city        YES

id , name , street                                             YES

id , name , street , city                                    YES

id , name , street , city,state                          YES

id , name , street , city,state,zip,phone         YES

All these are uniquely identified

All these are super key but in reverse they are not super key such as

street , city,state,zip,phone->id , name        No

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Explanation:

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