An outer join where the column in the join is a nullable boolean? Can you give me an example where doing that is better (easier to understand during maintenace) than using an integer? I do not go against all nulls, just boolean nulls.

Gavin King escribió:

So you never use outer joins? Every outer join produces null values.

On Thu, Dec 4, 2008 at 1:04 PM, Francisco Jose Peredo
<franciscoperedo@tabasco.gob.mx> wrote:

I try to avoid it in databases, if there are 3 different possible
values, it is better to use a not null Integer column, all my boolean
columns are "not null" always.

Emmanuel Bernard escribió:

Databases use this three-state for decades. It seems to work fine.

Many people believe it does not work fine:
http://en.wikipedia.org/wiki/Null_(SQL)#Controversy