On Tue, 16 Jan 2024, 17:21 Ron Johnson, <ronljohnso...@gmail.com> wrote:
> Some RDBMSs have CREATE ALIAS, which allows you to refer to a table by a > different name (while also referring to it by the original name). > > We have an application running on DB2/UDB which (for reasons wholly > unknown to me, and probably also to the current developer) extensively uses > this with two schemas: MTUSER and MTQRY. For example, sometimes refer to > MTUSER.sometable and other times refer to it as MYQRY.sometable. > > My goal is to present a way to migrate from UDB to PG with as few > application changes as possible. Thus, the need to mimic aliases. > > Maybe updatable views? > CREATE VIEW mtqry.sometable AS SELECT * FROM mtuser.sometable; > I think views will work. Alternative might be interpose a proxy to rewrite the SQL. https://www.galliumdata.com/ gives you an idea of what this might look like although could do a lite version yourself. >
