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(4) Distinguish between sequential access and direct access. Give an example of a type of application for which each is particularly appropriate?

QUESTION:

Distinguish between sequential access and direct access. Give an example of a type of application for which each is particularly appropriate? 

 

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(3) Describe the four actions involved in data management?

QUESTION:

Describe the four actions involved in data management? 

 

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(2) Demonstrate your understanding of data, metadata, and information using an example?

QUESTION:

Demonstrate your understanding of data, metadata, and information using an example? 

 

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(1) What is the difference between data, metadata, and information?

QUESTION:

What is the difference between data, metadata, and information?

 

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What is the result of an attempt to add, subtract, multiply, or divide two number fields, one of which contains a null value?

QUESTION:

What is the result of an attempt to add, subtract, multiply, or divide two number fields, one of which contains a null value?

 

SOLUTION

 

The Inclusion of a null value results in each of these computations yielding a null value as the result.

Which comparison operators can be used when searching for null values? Which comparison operators cannot be used when searching for null values?

QUESTION:

Which comparison operators can be used when searching for null values? Which comparison operators cannot be used when searching for null values? What is the result when these unacceptable comparison operators are used when searching for null values?

 

SOLUTION

 

None of the comparison operators except for IS NULL or IS NOT NULL can be used when searching for null values.

What is the difference between a character field that contains a null value and a character field that contains a single blank space?

QUESTION:

What is the difference between a character field that contains a null value and a character field that contains a single blank space?

 

SOLUTION

 

A character field that contains a null value is zero characters long, while a character field that contains a single blank space has a length of one character.