Why doesn't SQL support “= null” instead of “is null”?

Question

I\'m not asking if it does. I know that it doesn\'t.

I\'m curious as to the reason. I\'ve read support docs such as as this one on Working With Nu

Answer 1

The concept is that NULL is not an equitable value. It denotes the absence of a value.

Therefore, a variable or a column can only be checked if it IS NULL, but not if it IS EQUAL TO NULL.

Once you open up arithmetic comparisions, you may have to contend with IS GREATER THAN NULL, or IS LESS THAN OR EQUAL TO NULL