From: | Thomas Kellerer <spam_eater(at)gmx(dot)net> |
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To: | pgsql-admin(at)lists(dot)postgresql(dot)org |
Subject: | Re: Oracle to Postgres migration |
Date: | 2023-12-22 12:25:22 |
Message-ID: | d29456e3-f143-ba36-c4c3-cfe025a7bdc7@gmx.net |
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Lists: | pgsql-admin |
bimal maity schrieb am 20.12.2023 um 04:35:
> Hi,
>
> I have below query used in Oracle but while migrating to Postgres this code is not supported in Postgres.
> Could you please tell me how to resolve this?
>
> SELECT p.id_po, p.line_number, replace(replace(replace(RTRIM(XMLAGG(XMLELEMENT(name C, regexp_replace(p.protocol_number,'([[:cntrl:]])','', 'g'))ORDER BY 1), ',' ) ,'</C><C>','/'),'<C>',''),'</C>','') AS protocol_number
> ,replace(replace(replace(RTRIM(XMLAGG(XMLELEMENT(name C, regexp_replace(p.protocol_status,'([[:cntrl:]])','', 'g'))ORDER BY 1), ',' ) ,'</C><C>','/'),'<C>',''),'</C>','') AS protocol_status
> ,replace(replace(replace(RTRIM(XMLAGG(XMLELEMENT(name C, regexp_replace(p.protocol_approver,'([[:cntrl:]])','', 'g'))ORDER BY 1), ',' ) ,'</C><C>','/'),'<C>',''),'</C>','') AS protocol_approver
> ,max(p.protocol_date) AS protocol_date
> ,replace(replace(replace(RTRIM(XMLAGG(XMLELEMENT(name C, regexp_replace(p.protocol_nota,'([[:cntrl:]])','', 'g'))ORDER BY 1), ',' ) ,'</C><C>','/'),'<C>',''),'</C>','') AS protocol_nota
> ,sum(coalesce(p.protocol_value,0)) protocol_value
> FROM podl_extended_protocol p
> where upper(p.protocol_status) not in ('REJEITADO','ELIMINADO')
> group by p.id_po, p.line_number
What exactly does it do? I have often seen the hack using xmlagg/xmlelement/regexp_replace to do some kind of poor man's unnest/string_agg.
If you tell us, what exactly the goal is, I am confident there is a better solution in Postgres.
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