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On IBMi, you are not able to perform, throught SQL, a request to cross datas from differents systems.
Always get a SQLCODE 42712:
Message : [SQL0212] Indicatif de table en double A incorrect. Cause . . . . . : L'une des erreurs suivantes s'est produite : - Plusieurs tables d'une clause FROM d'une sous-requête ont pour indicatif le nom A. Si un nom de corrélation est indiqué, il s'agit de l'indicatif de table. Si aucun n'est indiqué, le nom de table ou de vue est l'indicatif de table. Si la convention d'appellation SQL est indiquée, le nom de table se compose du nom de schéma implicite ou explicite suivi du nom de la table proprement dit. Si la convention d'appellation système est indiquée, c'est le nom de table qui est utilisé sans qualifiant comme indicatif de table. L'indicatif de table doit être unique à chaque niveau d'une sous-requête. - Les noms indiqués dans la clause REFERENCING d'une instruction CREATE TRIGGER ne sont pas uniques. Les noms de corrélation NEW et OLD et les noms NEW_TABLE et OLD_TABLE doivent être uniques et différents du nom de la table associée au déclencheur. Que faire . . . : Assurez-vous qu'il n'existe qu'un seul indicatif de table pour chaque table d'une clause FROM pour le même niveau de sous-requête. Le nom de schéma/nom de table ne pouvant être utilisé pour qualifier une colonne, le nom de table doit être unique, ou bien un nom de corrélation doit être indiqué. Indiquez des noms uniques dans la clause REFERENCING de l'instruction CREATE TRIGGER. Corrigez les erreurs éventuelles et renouvelez votre demande.
If I want to check if users are defined on a second system compared to a reference one, i would like to be able to perform this resquest:
select A.AUTHORIZATION_NAME from SYSTEMA.qsys2.user_infos A, SYSTEMB.qsys2.user_infos B
where A.AUTHORIZATION_NAME not in (select B.AUTHORIZATION_NAME from SYSTEMB.qsys2.user_infos);
Idea priority | Medium |
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IBM does not intend to provide a solution to this request at this time, so it is being closed.
The database team has a long list of higher priority requirements, so this request is not likely to be implemented anytime soon.
Hello,
With Db2 for i, you can pull data from a target RDB via INSERT with subselect, CREATE TABLE AS, and DECLARE GLOBAL TEMPORARY TABLE AS.
To accomplish your requirement to compare user profiles against a target IBM i would require two steps if you use the technique above.
It is also possible for you to create your own UDTFs where you aggregate data from external sources and return them to the caller.
In this sense, you can achieve a result in a single query, if the UDTF pulls the data from the remote databases.
Db2 Connect includes the support to allow multiple databases to be referenced in a single query.
Since there are viable alternatives that can be used, this request is unlikely to be implemented in the near term.
Regards, Scott
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - Power Systems
Product - IBM i
Component - Db2 for i
Operating system - IBM i
Source - None
For recording keeping, the previous attributes were:
Brand - Servers and Systems Software
Product family - Power Systems
Product - IBM i
Component - Languages - Other
Operating system - IBM i
Source - None
Great RFE,
However, I think there is already an RFE regarding the use of three-part-names for joins and other SQL in general. This RFE is in the same category as three-part-names in UDTF and stored procedures.
https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=120817