Re: Dumb Character Column
Date: 26 Jan 2010 16:04:11 -0700
The Magnet (art_at_unsu.com) wrote:
: Ok, whomever wrote this dumbass application should be put on trial.
: Anyhow, we have a column in our table which is defined as VARCHAR2,
: but contains both numbers AND character data.
: Problem is that we need to do some < & > in a query on the numeric
: content. But, because of the character data we get an invalid
: number. If we quote the numbers it does a character compare, not a
: numeric compare.
: Still looking on the internet for an answer, but anyone here have any
Various ideas, one of which is both useable and simple. Create a function to use when you do the compare (perhaps in a package), something like
function my_to_number ( p varchar2 , the_default number default null ) return number is begin return to_number( p ); exception when LOOK_UP_ERROR_NAME then return the_default; when others then raise; end;
Now use that when doing the comparison, using a default that would make sense for the comparison. Many variations are possible, I won't suggest any because I think they should be obvious enough if that is not quite what you need.
$0.10 Received on Tue Jan 26 2010 - 17:04:11 CST