1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lubasha [3.4K]
3 years ago
8

What name is used to denote a common field that exists between two tables, but is also the primary key for one of the tables??"

Computers and Technology
1 answer:
Diano4ka-milaya [45]3 years ago
4 0

Answer:

b. foreign key

Explanation:

In the database world, a foreign key is a field on one table and a primary key for another table. The purpose of a foreign key is to provide linkages between two or more tables. Given two tables A and B, and making A the point of reference, a primary key is a field that is unique in A while a foreign key is unique in B.

On another hand, a composite primary key is a combination of two or more fields/columns on database table that can be used to uniquely identify each row in the table.

In the database lingua, what we have is a unique key not a distinct key, though the two words are similar in meaning.

A duplicate key is used when an information may be repeatedly entered on a table.

So the correct option is a foreign key.

You might be interested in
ACTIVITY NO. 5 (DAY 5) FACT OR BLUFF. Write Fact if the statement is correct and write Bluff if it is incorrect.
KengaRu [80]

All of the above are Facts.

preventive maintenance does indeed help with the lifespan etc.

If you are feeling tired or fatigued when operating machinery, stop and rest for fear of mistake. So , two is also correct

4if you dress inappropriately it may cause danger from getting caught in machinery or catching a flame depending on the worksite. so four is correct. Newer models are most likely more updated and have different operations then the last machine. so yes read the manual before using it. so yet again 5 is also correct.

hopefully this helped

3 0
3 years ago
It can be hard to get close enough to photograph animals in the wild true or false
marysya [2.9K]

Answer:

True

Explanation:

8 0
2 years ago
Read 2 more answers
What is metrical task system algorithm?? and can we use that in online shopping project??
jeyben [28]

Answer:

Metrical task system algorithm is the online algorithm that is used for organizing the online problems like k-server issues, paging issues etc.This task system works in the form of metrics to decrease the complete cost  experienced due to processing of the operation and analyzing the competition.

It can be used for the online shopping project for the analyzing the comparison between the performance on basis of online and offline trends and then optimization can take place according to the the results.

7 0
3 years ago
The Operating System provides utility software designed to perform specific tasks. What task(s) does it perform? Select all that
viktelen [127]

Answer:

All of the above.

Explanation:

An operating system is a system software pre-installed on a computing device to manage or control software application, computer hardware and user processes.

This ultimately implies that, an operating system acts as an interface or intermediary between the computer end user and the hardware portion of the computer system (computer hardware) in the processing and execution of instructions.

Some examples of an operating system on computers are QNX, Linux, OpenVMS, MacOS, Microsoft windows, IBM, Solaris, VM etc.

Hence, the operating system (OS) provides utility software designed to perform specific tasks. Some of the tasks it performs are;

A. Establishing an Internet connection.

B. Coordinating tasks between programs.

C. Configuring peripheral devices.

D. Monitoring security.

7 0
2 years ago
Description
lapo4ka [179]

Answer:

from datetime import time, datetime, timedelta, date

for _ in iter(list, 0):

   t1 = input("Please enter time one: ")

   t2 = input("Please enter time two: ")

   if t1.isdigit() == True and (int(t1[:2])<=23 and int(t1[2:]) <= 59)\

       and t2.isdigit() == True and (int(t2[:2])<= 23 and int(t2[2:])<=59):

       time_1 = time(hour=int(t1[:2]), minute=int(t1[2:]))

       time_2 = time(hour= int(t2[:2]), minute=int(t2[2:]))

       if time_1 > time_2:

           diff = datetime. combine (date. today( ), time_1) - datetime. combine(date. today ( ), time_2)

       else:

           diff = datetime. combine (date. today( ), time_2) -datetime. combine(date. today ( ), time_1)

       diff_list = str(diff).split(":")

       del diff_list[2]

       diff_t = "". join (diff_list)

       print(diff_t)

       break        

   if t1.isdigit() == False or t2.isdigit() == False:

       print("Military Time Forest Required: Bad input, try again.")

       continue

   elif int(t1[:2])> 23 or int(t2[:2])> 23:

       print("Military Tine Format Required: Hours must be between 00 and 23, try again")

       continue

   elif int(t1[2:])> 59 or int(t2[2:])> 59:

       print("Military Tine Format Required: Minutes must be between me and 59, try again")

       continue

Explanation:

The python Datetime package is used to manipulate date and time, creating immutable Datetime objects from the various python data types like integer and string. The block of code above is a conditional for-loop statement that gets two user time value inputs and prints out the difference as a string in Military forest time format.

5 0
3 years ago
Other questions:
  • Plagiarism occurs when writers
    14·2 answers
  • You are installing several servers that will be used as web servers to reach customers over the Internet. Where should you place
    14·1 answer
  • "You have installed a point-to-point connection using wireless bridges and Omni directional antennas between two buildings. The
    8·1 answer
  • Our Client, a renowned trading company, suffered a sudden, devastating power outage that caused their server to cease functionin
    13·1 answer
  • Which programming element is used by a game program to track and display score information?
    10·2 answers
  • Answer this question for points lol
    7·2 answers
  • It is important to know the terms of use of any website because why
    12·2 answers
  • Write a Java program that launches 1000 threads. Each thread adds 1 to a variable sum that initially is 0. You need to pass sum
    11·1 answer
  • A _____ is a computer that is deliberately set up to be easily hacked into.
    10·1 answer
  • Function of pons for class 7​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!