Describe the meaning and use of the NULL value in relational database systems. What logic complexities are introduced when allowing the use of NULLs. Give a real world example of when NULL values might be used, and what NULL would represent in that situation.
Solution
The basic syntax of NULL while creating a table:
Here, NOT NULL signifies that column should always accept an explicit value of the given data type. There are two columns where we did not use NOT NULL, which means these columns could be NULL.
A field with a NULL value is one that has been left blank during record creation.
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Describe the meaning and use of the NULL value in relational database.docx
1. Describe the meaning and use of the NULL value in relational database systems. What logic
complexities are introduced when allowing the use of NULLs. Give a real world example of
when NULL values might be used, and what NULL would represent in that situation.
Solution
The basic syntax of NULL while creating a table:
Here, NOT NULL signifies that column should always accept an explicit value of the given data
type. There are two columns where we did not use NOT NULL, which means these columns
could be NULL.
A field with a NULL value is one that has been left blank during record creation.
