Answer:
Explanation:
Duplicate tuples are not allowed in a relation because the specifications of the constraints of the regional integrity are violated, especially the main constraint that states that there can be no identical values for the attributes of two tuples at any database relation state.
Also, duplicate tuples are not allowed in a relation due to the fact that they lead to redundancy of the data base which in turn, slowing down the speed of the database when data processing such as inserting, querying, updating, deleting, etc are being performed.
Apple uses social media to promote their products and increase user-engagement. This is a very effective method of advertising.
B are primary and C are secondary.
The answer is Clip Art
Clip art is a collection of pictures or images that are either built-in or can be imported into a document. These pictures may either be vector graphics or raster graphics. Clip art gallery is typically organized into categories such as objects, people, nature, and many more. They can be anywhere between a few images to thousands of them.
Answer:
When data is written to a WORM drive, physical marks are made on the media surface by a low-powered laser and since these marks are permanent, they cannot be erased. Rewritable, or erasable, optical disk drives followed, providing the same high capacities as those provided by WORM or CD-ROM devices.
Explanation:
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