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Posted by Steve on 02/06/07 16:05
On Feb 6, 3:04 am, "Paul" <paulwragg2...@hotmail.com> wrote:
> Hi,
>
> I don't have any specific details as I do not really understand why
> this is happening but we have a customer database that we have been
> using and queries on text fields have begun returning empty string
> values instead of NULL.
>
> So for example:
>
> SELECT TAB1.DESCRIPTION
> FROM TABLE1 TAB1
> WHERE TAB1.DESCRIPTION IS NOT NULL
> ORDER BY 1
>
> may have returned 50 records in the past (purely an example). It is
> now returning an additional record first that appears just to be ''.
> Now I am not too sure where to begin looking into this. ODBC
> connections, collation settings? I just am not sure where to begin.
> The column will not have had '' inserted into it; therefore it should
> be NULL.
>
> I have posted this mainly so I can see if anybody else has seen this
> sort of behaviour - I cannot see why this has suddenly happened.
> The collation setting on our server is different to that of the
> customer DB, but this shouldn't make a difference should it?
>
> If anybody has any ideas then I can post some more information.
> Thanks,
>
> Paul
Changes that could cause this include:
1. setting a default value of '' for a column
2. added a default value of '' to a sproc that inserted records
3. changing NULL to '' in the insert in the application
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