Why is NULL interpreted as zero in arithmetic operations?
60338
Null vs. False vs. 0 in PHP
10313
Why Multiplication of zero by any number is zero?
158810
Why does >= return false when == returns true for null values?
90598
PHP considers null is equal to zero
28291
What is the difference between these (bCondition == NULL) and (NULL==bCondition)?
123797
Not equal  != operator on NULL
68876
Conditional operator assignment with Nullable types?
8283
Why does null reference print as "null"
114349
What is a null-terminated string?
104928
How To Represent 0.1 In Floating Point Arithmetic And Decimal
71059
How to perform arithmetic on values and operators expressed as strings?
79477
Why is "null" present in C# and Java?
45869
Why null cast a parameter?
124471
Comparing nullable column values using "IS NULL" versus "= NULL"
134318
Is it safe to check floating point values for equality to 0?
118788
Setting Zero values back to NULL
8808
Strange Java null behavior in Method Overloading