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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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. Convert your age into binary and then to hexadecimal. Show your work.
Dovator [93]

Explanation:

Age = 23.

To convert a base 10 number to hexadecimal number we have to repeatedly divide the decimal number by 16 until  it becomes zero and store the remainder in the reverse direction of obtaining them.

23/16=1 remainder = 5

1/16=0 remainder = 1

Now writing the remainders in reverse direction that is 15.

My age in hexadecimal number is (15)₁₆.

5 0
4 years ago
Would you expect all the devices listed in bios setup to also be listed in device manager? would you expect all devices listed i
katen-ka-za [31]
<span>Would you expect all the devices listed in bios setup to also be listed in device manager? = Yes
Would you expect all devices listed in device manager to also be listed in bios setup? = No, the BIOS doesn't know anything about your peripherals etc. that is all managed by the OS.</span>
6 0
3 years ago
When reading words using a Scanner object's next method, _________. a. any characters at the beginning of the input that are con
zavuch27 [327]

Answer:

The answer is "Option d"

Explanation:

The scanner method is the full token of the process, that finds and returns. It is token, which is followed by both the inputs meeting and the guideline template. This method can block, even though the former instance of hasNext() is true while waiting for input, and wrong choices can be described as follows:

  • In option a, It is incorrect because the character at the beginning can't be considered.
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3 0
3 years ago
Studying MyMagic+ helps one understand the costs associated with information systems deployment at scale. According to your read
vlabodo [156]

Answer:

The answer is "Training".

Explanation:

It is a technology programming that relates to tools, organizations, and services. It focused on helping consumers learn about technology-related topics. It is also known as the registered technology training services, that educate and assist customers in different fields, and incorrect option can be defined as follows:

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8 0
4 years ago
True or False? To use a C++ library function, you must use an #include directive to include the appropriate header file.
lakkis [162]

Answer:

True

Explanation:

While programming in most programming languages, one will have need to use functions and variables defined in other class libraries. in C++, these functions and variables' definitions are contained in Header files, which can be imported and used into any C++ program by using the pre-processor #include statement. This statement is the equivalent of import in java and copy in other languages. Popular header files are the Maths class (Allows use of maths functions like power, square roots exponentiation etc), the input/output (allows usage of cout print statement and cin input statement)

7 0
3 years ago
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