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.
Answer:
If a photo is too dark, it is underexposed. Details will be lost in the shadows and the darkest areas of the image. If a photo is too light, it is overexposed. Details will be lost in the highlights and the brightest parts of the image.
Many <u>online training</u> classes for certification are made available for students on the Internet and by many companies that have set up intranets within their organizations.
Certification can be defined as a recognition that is given to an individual (student) for the completion of a specific course of study and passing an examination. Thus, it usually issued to certify that an individual is a professional in a particular course of study.
Some examples of certifications that are issued to an individual (student) include the following:
In this context, many companies with intranet facilities within their organizations offer <u>online training</u> classes for certification by making them available for students over the Internet.
Read more on certification here: brainly.com/question/1391803
Answer:
C
Explanation:
When an Ethernet NIC has been configured by the OS to use half-duplex, the transmit pair of the cable uses SIMPLEX transmissions, the receive pair in the SIMPLEX transmissions, and the twisted pair cable uses HALF-DUPLEX transmissions.
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