Categories:
.NET (357)
C (330)
C++ (183)
CSS (84)
DBA (2)
General (7)
HTML (4)
Java (574)
JavaScript (106)
JSP (66)
Oracle (114)
Perl (46)
Perl (1)
PHP (1)
PL/SQL (1)
RSS (51)
Software QA (13)
SQL Server (1)
Windows (1)
XHTML (173)
Other Resources:
What Are NULL Values
What Are NULL Values? - MySQL FAQs - Introduction to SQL Basics
✍: FYIcenter.com
NULL is a special value that represents no value. Here are basic rules about NULL values:
The tutorial exercise shows you some interesting examples:
SELECT 0 IS NULL FROM DUAL; 0 SELECT 0 IS NOT NULL FROM DUAL; 1 SELECT '' IS NULL FROM DUAL; 0 SELECT '' IS NOT NULL FROM DUAL; 1 SELECT NULL IS NULL FROM DUAL; 1 SELECT NULL IS NOT NULL FROM DUAL; 0
2007-05-11, 4892👍, 0💬
Popular Posts:
What Is the "@SuiteClasses" Annotation? "@SuiteClasses" is a class annotation defined in JUnit 4.4 i...
What is the purpose of finalization? The purpose of finalization is to give an unreachable object th...
Jack developed a program by using a Map container to hold key/value pairs. He wanted to make a chang...
Can you explain in brief how can we implement threading ? Private Sub Form1_Load(ByVal sender As Sys...
How To Set session.gc_maxlifetime Properly? - PHP Script Tips - Understanding and Using Sessions As ...