Space of NULL values?
25074
NULL in MySQL (Performance & Storage)
19902
Shortcut for "null if object is null, or object.member if object is not null"
29684
How to check if an object is nullable?
158810
Why does >= return false when == returns true for null values?
141629
When was the NULL macro not 0?
110482
Explicit space character?
93530
SQL Server 2008 Empty String vs. Space
88125
What can you say about the range space and null space
35252
How do I trim whitespace?
88920
Is using NULL references OK?
120428
Entering null characters in a string
132398
What is null in Java?
10184
Altering a column: null to not null
73034
StringBuilder append() and null values
120071
Checking for a null int value from a Java ResultSet
157835
SQL Data Reader - handling Null column values
5640
How to check a string against null in java?