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sladkih [1.3K]
3 years ago
13

In a relational database, a primary key is sometimes made up of multiple fields. What is this known as?

Computers and Technology
1 answer:
wlad13 [49]3 years ago
5 0

Answer:

Foreign key is the correct answer for the above question.

Explanation:

  • A foreign key is a key that is used to extract the information of a foreign table with the help of primary key value. When there is a normalized table then it needs to split on two or more tables to overcome the problem of normalization.
  • So is there is a two table then the primary key is used for the first table and the combination of the primary key and foreign key is used to identify the record of the foreign table. The foreign key is made up of multiple fields because there is no single field in the foreign which can not be null for any instance of the primary table. It happens when there is data for the primary table but there is no record for the foreign table.
  • The above question wants to ask about the term which is made up of multiple fields which is a foreign key which is described as above. Hence Foreign key is the correct answer for the above question.
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Answer:

The answer is "Multiple computers and Host network".

Explanation:

In the given-question, some data is missing so, the correct answer to this can be defined as follows:

A computer server with the help of an operating system enables to access the data in the multiple computers simultaneously and the Host network allows for access.

  • The host network is also used to access the network on the computer, which will be a client or a server.
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Answer:

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Explanation:

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Write a function called missing_letters that takes a string parameter and returns a new string with all the letters of the alpha
kompoz [17]

A string parameter and returns new string with all the letters of the alphabet that are not in the argument string. The letters in the returned string should be in alphabetical order. The implementation should uses a histogram from the histogram function

Explanation:

The below code is written in python :

alphabet = "abcdefghijklmnopqrstuvwxyz"

test_dups = ["zzz","dog","bookkeeper","subdermatoglyphic","subdermatoglyphics"]

test_miss = ["zzz","subdermatoglyphic","the quick brown fox jumps over the lazy dog"]

def histogram(s):

   d = dict()

   for c in s:

       if c not in d:

           d[c] = 1

       else:

           d[c] += 1

   return d

def has_duplicates(s):

   for v in histogram(s).values():

       if v > 1:

           return True

   return False

def test_dups_loop():

   for s in test_dups:

       print(s + ':', has_duplicates(s))

def missing_letters(s):

   r = list('abcdefghijklmnopqrstuvwxyz')

   s = s.lower()

   for c in s.lower():

       if c in r:

           r.remove(c)  # the first matching instance

   return ''.join(r)

def test_miss_loop():

   for s in test_miss:

       print(s + ':', missing_letters(s))

def main():

   test_dups_loop()

   test_miss_loop()

if __name__ == '__main__':

   main()

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