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From: Frank Swarbrick on 23 Jun 2008 11:38
>>> On 6/22/2008 at 6:58 PM, in message
<6c8apkF28va8mU1(a)mid.individual.net>,
Serge Rielau<srielau(a)ca.ibm.com> wrote:
> Frank Swarbrick wrote:
>> How can I fix this so that it doesn't do essentially the same scan
>> twice, but it gives the same results (a single row where
>> IDENTITY_MODIFIER is either 'identityoverride' or '' and
>> ROWCHANGETIMESTAMP_MODIFIER is either 'rowchangetimestampoverride' or
> ''?
>>
>> select
>> case
>> when exists (
>> select *
>> from syscat.columns
>> where tabschema = 'FRANK'
>> and tabname = 'INVOICE'
>> and identity = 'Y'
>> ) then 'identityoverride'
>> else ''
>> end as identity_modifier
>> , case
>> when exists (
>> select *
>> from syscat.columns
>> where tabschema = 'FRANK'
>> and tabname = 'INVOICE'
>> and rowchangetimestamp = 'Y'
>> ) then 'rowchangetimestampoverride'
>> else ''
>> end as rowchangetimestamp_modifier
>> from sysibm.sysdummy1;
>>
>> Results:
>>
>> IDENTITY_MODIFIER ROWCHANGETIMESTAMP_MODIFIER
>> ----------------- ---------------------------
>> identityoverride rowchangetimestampoverride
>>
>> 1 record(s) selected.
> You need to select straight from syscat.columns and then use GROUP BY to
>
> pivot the two rows into columns.

Thanks, Serge! You made me work a bit <g>, but here's what I now have
(placed into a VIEW):

create view load_modifiers
as
select tabschema
, tabname
, max(case when identity = 'Y' then 'identityoverride' else '' end) as
identity_modifier
, max(case when rowchangetimestamp = 'Y' then
'rowchangetimestampoverride' else '' end) as rowchangetimestamp_modifier
from syscat.columns
group by tabschema, tabname
;

select identity_modifier
, rowchangetimestamp_modifier
from load_modifiers
where tabschema = 'CUSTOMER'
and tabname = 'ACCOUNTS'
;

IDENTITY_MODIFIER ROWCHANGETIMESTAMP_MODIFIER
----------------- ---------------------------
identityoverride rowchangetimestampoverride

1 record(s) selected.

Also gets good results when table does not include one or the other (or
both) types of columns.

Good stuff!

Frank

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