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c# - What does null! statement mean? - Stack Overflow It can be used on a type to control Nullability, it is then called the "Null Forgiving Operator" Basically, null! applies the ! operator to the value null This overrides the nullability of the value null to non-nullable, telling the compiler that null is a "non-null" type
How do I check for null values in JavaScript? - Stack Overflow And then == null does a perfect job, because it covers exactly those 2 values (i e == null is equivalent to === null === undefined) In exceptional cases you do want a clear distinction between null and undefined
What is the difference between is not null and != null? The main difference between e != null and e is not null is the way the the compiler executes the comparison Microsoft: "The compiler guarantees that no user-overloaded equality operator == is invoked when expression x is null is evaluated "
SQL is null and = null - Stack Overflow 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 provides the special syntax for testing if a column is null, via is null and is not null, which is a special condition to test for a null (or not a null)
Why does NULL = NULL evaluate to false in SQL server The expression "NULL = NULL" evaluates to NULL, but is actually invalid in SQL; yet ORDER BY treats NULLs as equal (whatever they precede or follow "regular" values is left to DBMS vendor)
sql - Not equal lt; gt; != operator on NULL - Stack Overflow 135 NULL has no value, and so cannot be compared using the scalar value operators In other words, no value can ever be equal to (or not equal to) NULL because NULL has no value Hence, SQL has special IS NULL and IS NOT NULL predicates for dealing with NULL
¿Qué es una NullReferenceException y cómo solucionarla? En numerosas ocasiones se recibe una NullReferenceException, siendo una de las excepciones que más preguntas suscita ¿Qué significa NullReferenceException y cómo se puede solucionar? Para el
What is the difference between NULL, \0 and 0? - Stack Overflow In C, there appear to be differences between various values of zero -- NULL, NUL and 0 I know that the ASCII character '0' evaluates to 48 or 0x30 The NULL pointer is usually defined as: #define
What are the differences between Null, Zero and Blank in SQL? Comparing NULL with anything yields a NULL NULL is part of trinary logic: TRUE, FALSE, and NULL -- These are all NULL select NULL > -1, NULL < -1, NULL = NULL, NULL = 0; Blank is ill-defined It means different things in different contexts to different people For example: AFAIK, there is no SQL or MySQL specific technical meaning for "blank"
What is the convention in JSON for empty vs. null? I know that in most programming scenarios, the preference is for empty collections to null collections when there are 0 elements However, most languages that consume JSON (like JavaScript) will t