Why does NULL = NULL evaluate to false in SQL server
Dec 4, 2009 · 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 …
What's the difference between " = null" and " IS NULL"?
May 1, 2010 · Understanding the difference between “IS NULL” and “= NULL” When a variable is created in SQL with the declare statement it is created with no data and stored in the variable …
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 …
sql - Not equal <> != operator on NULL - Stack Overflow
Apr 14, 2011 · 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 …
How to send NULL in HTTP query string? - Stack Overflow
So if you don't need to support the difference between empty and null/absent string you may also consider the empty parameter as null. If instead you want to recreate point 4. of JSON …
How do I create a unique constraint that also allows nulls?
Apr 20, 2009 · I want to have a unique constraint on a column which I am going to populate with GUIDs. However, my data contains null values for this columns. How do I create the constraint …
Best way to check for null values in Java? - Stack Overflow
The null check will be at least a thousand times faster (probably many thousands). For the path of execution to get into the catch block an exception has to have been raised which means …
What exactly is meant by "dereferencing a NULL pointer"?
In other words, a null pointer is a pointer of any type pointing at a well-defined "nowhere". Any pointer can turn into a null pointer when it is assigned a null pointer constant. The standard …
How can I check for an undefined or null variable in JavaScript?
The title of this bug says "check for undefined or null", but the question itself checks for undeclared or null.
How to ignore a property in class if null, using json.net
Jun 28, 2011 · This comes in handy if you want a null item to appear in the JSON so the consumer doesn't have to do any special handling. If, for example, the consumer needs to …