Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

Re^3: "undef" is not NULL and what to do about it

by runrig (Abbot)
on Feb 21, 2013 at 00:06 UTC ( #1019867=note: print w/replies, xml ) Need Help??

in reply to Re^2: "undef" is not NULL and what to do about it
in thread "undef" is not NULL and what to do about it

an empty string IS a NULL. There is no difference at all.

I think the point is you can not select the data using, e.g.WHERE colname = ''.

So how do you represent unknown values? By using a default "UNKNOWN"?

Sometimes you know what the value is, and it's blank. There's just too many ways to look at it.


Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1019867]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (4)
As of 2016-10-28 01:57 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (374 votes). Check out past polls.