Re: weird(to me) request

--On Thursday, September 25, 2003 20:59:25 +0200 Adam Wieckowski
<adam-wieckowski(at)tlen(dot)pl> wrote:

> U¿ytkownik Larry Rosenman napisa³:
>
>> I have the following rows (in addition to others):
>>
>> acct_num text,
>> master_acct_num text,
>>
>>
>> These are in the same table.
>>
>> What I want to enforce is that if the master_acct_num field is NOT
>> NULL (it can be NULL, and
>> that's fine), that the value appears in some row as acct_num.
>> acct_num has a unique index on it, so that's fine.
>>
>> I'm not sure how to do this....
>>
>> Thanks!
>>
>> LER
>>
>>
> select
> case
> when master_acct_num is null
> then acct_num
> else master_acct_num
> end
> from table;
>
> did you mained somethink like this ?

I'm actually looking to enforce the fact that if master_acct_num is
entered, it points
to a valid acct_num.

LER

--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler(at)lerctr(dot)org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749