Because NULL markers do not represent a value, SQL has two conditions specific to the SQL language: IS NULL IS NOT NULL SQL also provides three functions to evaluate NULL markers: NULLIF ISNULL ...

Therefore, using NULL should be a conscious decision, not a default choice. Ultimately, your qualification to use NULL in SQL depends on your understanding of its nuances and your ability to implement ...

Is your SQL drawing a blank? It’s NULL a surprise! The title of this post is a play on words, but very appropriate. We are going to discuss the inconsistent results, as well as performance ...

We're developing against SQLite, but when I go to add a NOT NULL column with no default specified, I get an error. I was attempting to add a foreign key originally, but it seems there's conflicting ...

IS NULL and IS MISSING are predicates that test for a missing value. IS NULL and IS MISSING are used in the WHERE, ON, and HAVING expressions. Each predicate resolves to true if the sql-expression's ...

Design for null. “Expect that you will get null results and collect the data that allows you to explain it,” Hill urges. At the end of a recent study, her team interviewed teachers about what made ...

So I have a method:int Foo()It either returns a value if successful or NULL if not. If I'm not mistaken, if I try something like:int bar; bar = Foo();and Foo() returns NULL, then my program will ...