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Svetlanka [38]
3 years ago
15

Referential integrity states that:______.

Computers and Technology
1 answer:
densk [106]3 years ago
7 0

Answer:

D. Each foreign key value MUST match a primary key value in another relation or the foreign key value must be null.

Explanation:

In Computer programming, integrity constraints can be defined as a set of standard rules that ensures quality information and database are maintained.

Basically, there are four (4) types of integrity constraints and these are;

1. Key constraints.

2. Domain constraints.

3. Entity integrity constraints.

4. Referential integrity constraints.

Referential integrity states that each foreign key value must match a primary key value in another relation or the foreign key value must be null.

For instance, when a foreign key in Table A points to the primary key of Table B, according to the referential integrity constraints, all the value of the foreign key in Table A must be null or match the primary key in Table B.

<em>Hence, the referential Integrity constraints ensures that the relationship between the data in a table is consistent and valid. </em>

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Tanya is entering the amount of money she has earned from babysitting onto an Excel spreadsheet, but the AutoComplete feature is
makkiz [27]

Answer: AutoComplete only works when there is text.

3 0
3 years ago
What is true about super computers?
lorasvet [3.4K]

Explanation:

Super Computer are expensive computer that are used to provide very quick results. Super computer are used in calculating complex mathematical calculations. Calculations such as weather forecast and Atomic energy research. Therefore Super Computer perform complex calculations rapidly.

5 0
3 years ago
Determina la cilindrada total Vt en un motor de 4 cilindres de 83,6 mm de diàmetre per 91 mm de cursa.
insens350 [35]

Answer:

La cilindrada total del motor es de 1997,025 centímetros cúbicos.

Explanation:

Para determinar la cilindrada total Vt en un motor de 4 cilindros de 83,6 mm de diámetro por 91 mm de carrera se debe realizar el siguiente cálculo, sabiendo que para calcular la cilindrada de un motor se debe utilizar la fórmula ((Pi x Diámetro^2)/4) x Carrera x Número de cilindros = X:

((3.14 x 83.6^2)/4) x 91 x 4 = X

((3.14 x 6,988.96)/4) x 364 = X

(21,945.3344 / 4) x 364 = X

5,486.3336 x 364 = X

1,997,025.4304 = X

1 milímetro cúbico = 0.001 centímetro cúbico

1,997,025.4304 milímetros cúbicos = 1997.0254304000005 centímetros cúbicos

Por lo tanto, la cilindrada total del motor es de 1997,025 centímetros cúbicos.

3 0
3 years ago
Is it possible for a PowerPoint user to add notes to slides and see the added comments
Arturiano [62]

Answer:

I am not for sure on this, but yes I think it is possible for the PowerPoint user to add notes to slides and see the added comments. If it isn't possible I know for a fact on Google slides it is possible.

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hope this helps! :)

7 0
3 years ago
What impact did congress declaration on copyrighting sound recordings have on home recording and record sales
cricket20 [7]

Answer:

By the late 1980s, several manufacturers were prepared to introduce read/write digital audio formats to the United States. These new formats were a significant improvement over the newly introduced read-only (at the time) digital format of the compact disc, allowing consumers to make perfect, multi-generation copies of digital audio recordings. Most prominent among these formats was Digital Audio Tape (DAT), followed in the early 1990s by Philips' Digital Compact Cassette (DCC) and Sony's Minidisc.

DAT was available as early as 1987 in Japan and Europe, but device manufacturers delayed introducing the format to the United States in the face of opposition from the recording industry. The recording industry, fearing that the ability to make perfect, multi-generation copies would spur widespread copyright infringement and lost sales, had two main points of leverage over device makers. First, consumer electronics manufacturers felt they needed the recording industry's cooperation to induce consumers – many of whom were in the process of replacing their cassettes and records with compact discs – to embrace a new music format. Second, device makers feared a lawsuit for contributory copyright infringement.[1]

Despite their strong playing hand, the recording industry failed to convince consumer electronics companies to voluntarily adopt copy restriction technology. The recording industry concurrently sought a legislative solution to the perceived threat posed by perfect multi-generation copies, introducing legislation mandating that device makers incorporate copy protection technology as early as 1987.[2] These efforts were defeated by the consumer electronics industry along with songwriters and music publishers, who rejected any solution that did not compensate copyright owners for lost sales due to home taping.[3]

The impasse was broken at a meeting in Athens in 1989, when representatives from the recording industry and the consumer electronics industry reached a compromise intended to enable the sale of DAT recorders in the United States. Device manufacturers agreed to include SCMS in all consumer DAT recorders in order to prevent serial copying. The recording industry would independently pursue legislation requiring royalties on digital audio recording devices and media.[4]

A year later the songwriter Sammy Cahn and four music publishers, unhappy with the absence of a royalties provision in the Athens agreement, filed a class action copyright infringement suit against Sony.[5] The plaintiffs sought declaratory and injunctive relief that would have prevented the manufacture, importation or distribution of DAT recorders or media in the United States. The suit brought Sony to heel. In July 1991, Sony, as part of larger agreement between the recording industry and consumer electronics makers, agreed to support legislation creating a royalty scheme for digital media. In exchange, Cahn and the publishers agreed to drop the suit.[6]

With all the major stakeholders satisfied, the bill easily passed both houses of Congress. President George H. W. Bush signed the AHRA into law in 1992 proclaiming " S. 1623 [AHRA] will ensure that American consumers have access to equipment embodying the new digital audio recording technology. It also protects the legitimate rights of our songwriters, performers, and recording companies to be fairly rewarded for their tremendous talent, expertise, and capital investment. This will be accomplished by fairly compensating these artists for the copying of their works and by creating a system that will prevent unfettered copying of digital audio tapes."

3 0
3 years ago
Read 2 more answers
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