Explain what a null is and what some the implications of nulls ...

[Starlight]

Explain what a null is and what some the implications of nulls are for databases.
 
  What will be an ideal response?

Question 2

A policy is a set of rules for how to do things.
 
  Indicate whether the statement is true or false

[ebonylittles]

Answer to Question 1

A null is the absence of a value. That means that it cannot be compared to other values. It also can't really be counted or included in calculations. Despite these facts, a null is often a better choice than a zero or an empty string, because it accurately reflects the unknown status of the value rather than substituting a value that may not be accurate and may effect calculations.

Answer to Question 2

TRUE

[Starlight]

Wow, this really help

[xiazhe]

Thanks for the timely response, appreciate it