Why is != not working? how to compare with null values?
114718
Is there a DBMS that allows the "= NULL" syntax?
4772
Difference between "not equal" operators  and != in PHP
33574
Comparing a string with the empty string (Java)
19211
PHP if not equal(!=) and or (||) issue. Why doesnt this work?
65944
Easier way of writing null or empty?
36270
Nullable type issue with ?: Conditional Operator
113187
Comparing Java enum members: == or equals()?
3574
What is the !! (not not) operator in JavaScript?
99447
What is the difference between String? and String! (two ways of creating an optional variable)?
576
How can I check for an empty/undefined/null string in JavaScript?
29684
How to check if an object is nullable?
140931
What is the difference between if(!!condition) and if(condition)
109567
How does operator  work when comparing two strings?
73430
C# .Equals(), .ReferenceEquals() and == operator
69801
What does it mean when ST_Equals returns false and `=` returns true?
141442
Why does my string comparison fail?
152733
How to simplify a null-safe compareTo() implementation?