sql - Not equal <> != operator on NULL - Stack Overflow
Apr 14, 2011 · Which is why you can only use IS NULL/IS NOT NULL as predicates for such situations. This behavior is not specific to SQL Server. All standards-compliant SQL dialects …
javascript - Why is null an object and what's the difference …
Apr 29, 2009 · The surprise expressed by JavaScript developers at typeof null === "object" is the result of an impedance mismatch (or abstraction leak) between a weakly-typed language …
language agnostic - What is the purpose of null? - Stack Overflow
Feb 25, 2009 · Also, the null character in a C-style variable length string is used to mark the end of the string. The use of null in these ways, especially for pointer values, has become so …
How do I check for null values in JavaScript? - Stack Overflow
Jan 4, 2024 · Comparing null === 0 or null > 0 or null < 0 will result in false. But as null is also an object we can detect it as a null. I made a more complex function natureof witch will do better …
SQL is null and = null - Stack Overflow
Mar 6, 2012 · The reasoning is that a null means "unknown", so the result of any comparison to a null is also "unknown". So you'll get no hit on rows by coding where my_column = null. SQL …
What's the difference between " = null" and " IS NULL"?
Apr 16, 2020 · Now IS NULL is a little trickier and is the preferred method for evaluating the condition of a variable being NULL. When you use the “IS NULL” clause, it checks both the …
What is the difference between NULL, '\0' and 0? - Stack Overflow
A constant expression of type int with the value 0, or an expression of this type, cast to type void * is a null pointer constant, which if converted to a pointer becomes a null pointer. It is …
Java null check why use == instead of .equals() - Stack Overflow
Feb 5, 2012 · @RogerWang - Good question! The answer is that null isn't an object, it's an object reference (a blank one). It's the only object reference we can write literally in code. So Object …
When should I use ?? (nullish coalescing) vs || (logical OR)?
The null(ish) coalescing operator only works with null and undefined. So, use the null(ish) ...
How to check for an undefined or null variable in JavaScript?
The one benefit I can see is that it does not require knowing that == null and != null treat a declared variable with value undefined as equal to null. IMHO, that isn't reason enough to use …