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  3. May 2015

Re: Bad numeric data

On 14-May-2015 10:42 -0500, John McKee wrote:

A field on a file on the remote 520 is defined as numeric 8 0.
Supposed to have date in form of CCYYMMDD. I ran a query on the
field. Lots of bad values. I was hoping to see what might be in the
field. Never worked with CAST in SQL. Never needed to before.

When I try this:

select cast(xxxxxx as char(20) from xxxxxx. I get either some numeric
value (usually a single 0) or the '+' sign with it repeated 20
times.

An IBM query on the field showed the values as different - at least
when sorted and grouped, each group had one record.

I am not sure, yet, what value should be forced into the field to
clean up the data.

How do I add a where to the above select to only locate non-numeric
values?
They are all numeric value, according to the data type :-) When those value stored as a numeric type can not be cast to a character value, the internal representation of the numeric value is invalid; still, the system maintains them as /numeric/ even if unable to present them otherwise. Sorting and selection for which a decision about the inclusion or omission of the row [without other predicates precluding them from the result set] should result in the termination of the query; any other result is Incorrect Output.
See the following for an example of how to find the rows with invalid Zoned decimal data in the column; the query shown includes the Hex version of the data to reveal what data is there instead of the proper Zoned BCD (Binary Coded Decimal) data: 
<http://archive.midrange.com/midrange-l/200907/msg00517.html>
I suppose the next question might be what of those numeric values are not proper /date/ representations. I have posted examples of that too... and could look one up if asked.

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