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.
Answer:
The answer is Frequency Spectrum.
Explanation:
The frequency spectrum is range of all component frequencies.It contains all the waves which are as following:-
Gamma Rays
X-Rays
Ultraviolet
Visible light.
Infrared
Micro wave
Radio wave
These all waves have their range of frequencies.The waves that are visible to us is only the visible light.
brainly.com/question/10887381
Answer:You need 7 bits to encode everything that could be typed on this keyboard.
Explanation:
The encoding of the QWERTY keyboard is based on the extended ASCII encoding. The "ASCII" code was created by the "American standards association" in 1963.The acronym of “American Standard Code for Information Interchange” is ASCII. ASCII is a 7-bit code.
Further Explanation:
The QWERTY keyboard is the standard computer and typewriter keyboard design for Latin-script alphabets. The first six letters of the keyboard's upper row indicate its name. Christopher Latham Sholes designed the layout of the keyboard for his "Type-Writer". It was first mass-produced in 1874.
In QWERTY keyboard, extended American Standard for Information Interchange (ASCII) method is used for characters encoding. Alphabetical order of English language is the base of ASCII method of characters encoding.
Learn More:
Learn more about QWERTY keyboard: brainly.com/question/649081; Answered by: Jessusulas
Learn more about ASCII: brainly.com/question/7851735; Answered by: LearnGrow
Keywords:
QWERTY keyboard, The encoding of the QWERTY keyboard, American Standard for Information Interchange, ASCII
