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Charra [1.4K]
4 years ago
5

Under what circumstances are composite primary keys appropriate?

Computers and Technology
1 answer:
guajiro [1.7K]4 years ago
8 0
A composite primary key<span> is a set of several primary </span>keys<span> that, together, uniquely identifies each record.</span>
Primary keys are used as identifiers of composite entities. In this case each primary key combination is allowed only once in the *:* relationship.
Other case where primary keys are used is as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity. 
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What is the absolute pathname of the YUM configuration file? REMEMBER: An absolute pathname begins with a forward slash
ale4655 [162]

Answer:

/etc/yum.conf

Explanation:

The absolute pathname for YUM is /etc/yum.conf. The configuration file For yum and related utilities can be found there. The file has one compulsory section, and this section can be used to place Yum options with global effect, it could also have one or more sections, that can enable you to set repository-specific options.

4 0
4 years ago
Point mode allows you to select cells for use in a formula by using your finger or the pointer
Serga [27]
That statement is true

in excel, you could enter point mode by pressing any keyboard navigation such as page down, page up, or the arrow keys or by clicking any cells in the worksheet

This mode will select a cell or range as formula operand


7 0
3 years ago
Several of the items below indicate the steps required to move a slide to a different location in a presentation. Select those s
Llana [10]

Answer:

1 - Select the slide you want to move

2- Hold down the mouse button

3- Drag the slide where you want it

4 - NA

5- NA

6- NA

Explanation:

1 - Select the slide you want to move

it allows us to select the slide which we want to move by just clicking left mouse button

2- Hold down the mouse button

it allows the selected slide to stick with cursor

3- Drag the slide where you want it

It allows the slide stick with the cursor to drag it by moving the cursor to the required position

4 - NA (Choose move from the toolbox menu)

There is on toolbox against the slide as toolboxes are only available within a slide that is what we are writing on the slides

5- NA (Enter the slide position you want)

There is no command line in which we may enter the slide position to move the slide to a different serial number

6- NA (Switch to the Notes view)

Switching to notes view allows us to write notes with the corresponding slide whereas it doesn't do anything related to moving the slide

5 0
3 years ago
An elevator of mass 250kg is carrying two persons whose masses are 50kg and 100kg. if the force exerted by the motor is 3000N. C
Agata [3.3K]

m_{elevator}=250kg \\m_{people}=50kg+100kg=150kg \\m_{motor}\approx3000N\div10\frac{m}{s^2}\approx300kg \\m_{total}\approx250kg+150kg+300kg\approx\boxed{700kg}

Hope this helps.

r3t40

5 0
3 years ago
Where must virtualization be enabled for VM (virtual machine) software to work?
Lelu [443]

Answer:

b) BIOS/UEFI

Explanation:

Virtualization can be defined as a technique used for the creation of a virtual platform such as a storage device, operating system, server, desktop, infrastructure or computing resources so as to enable the sharing of resources among multiple end users. Virtualization is usually implemented on a computer which is referred to as the "host" machine.

Generally, virtualization must be enabled in the BIOS/UEFI for VM (virtual machine) software to work.

BIOS is an acronym for Basic Input/Output System while UEFI is an acronym for Unified Extensible Firmware Interface. BIOS/UEFI are low-level software that serves as an intermediary between the operating systems and the computer's firmware or hardware components. The UEFI is actually an improvement of the BIOS and as such is a modernized software.

Basically, the BIOS/UEFI is a software which is an essential tool or feature which must be enabled to link the virtual machine with the hardware components of the computer.

5 0
3 years ago
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