NOT NULL N O T N U L L O N T U L L

>>57864770
Please tell me /g/ it wasn't all for null.

What the fuck is the point of this thread? fuck off.

>>57864770
>N O T N U L L
>O N
>T U
> L
> L

Are you always this much of a fuckup?
also sage

>>57864770

Tenary logic, my friend:

[Name]  |  [Age]
Johny |  12
Jacky |  10
Jamie |  NULL 

SELECT * FROM table WHERE Age = 12
>1 row, Name = Johny

SELECT * FROM table WHERE Age <> 12
>1 row, Name = Jacky

SELECT * FROM table WHERE Age IS NULL
>1 row, Name = Jamie

>>57865994

So to enforce boolean logic you use NOT NULL.

Therefore every row for a NOT NULL column has the property of either "a = x" or "a <> x" for a valid value of x.