Define null values. 

In some cases a particular entity might not have an applicable value for an attribute or if we do not know the value of an attribute for a particular entity. In these cases null value is used.

 

Posted Date: 7/27/2013 6:48:32 AM | Location : United States

Ask an Expert

Related Discussions:- Define null values, Assignment Help, Ask Question on Define null values, Get Answer, Expert's Help, Define null values Discussions

Write discussion on Define null values
Your posts are moderated

Write your message here..

Related Questions

Determine the comparison of gouraud and phong shading, Comparison of Gourau... Comparison of Gouraud and Phong Shading Phong shading requires more calculations, but produces better results for specular reflection than Gouraud shading in the form of more r

Difference in grounded header and circular header Link List, Q. State the d... Q. State the difference between a grounded header link list and a circular header link list?     Ans: A header linked list is a linked list which all the time c

Explain binary search tree, Binary search tree. A binary search tree is... Binary search tree. A binary search tree is a binary tree that is either empty or in which every node having a key that satisfies the following conditions: - All keys (if an

Explain the assertions in ruby, Explain the Assertions in Ruby Ruby off... Explain the Assertions in Ruby Ruby offers no support for assertions whatever. Moreover, because it's weakly typed, Ruby doesn't even enforce rudimentary type checking on opera

Hashing and five popular hashing functions, Q. Explain the term hashing? Ex... Q. Explain the term hashing? Explain any five well known hash functions.                         Ans: Hashing method provides us the direct access of record from the f

Define the term array, Define the term array. An array is a way to refe... Define the term array. An array is a way to reference a series of memory locations using the same name. Each memory location is represented by an array element. An  array eleme

Calculate the k-th power and recursive algorithem, 1. The following is a r... 1. The following is a recursive algorithm to calculate the k -th power of 2. Input k a natural number Output kth power of 2 Algorithem: If k =0then return 1 Else return 2* po

Graph, explain the prims''s algorithm with suitable example? explain the prims''s algorithm with suitable example?

Omega notation, omega notation definition? omega notation definition?

Insertion sort, It is a naturally occurring sorting method exemplified thro... It is a naturally occurring sorting method exemplified through a card player arranging the cards dealt to him. He picks up the cards like they are dealt & added them into the neede