[Zope] Joins can be tricky (was "how to join two table?")

[Anthony Baxter]

>>> "Shalabh Chaturvedi" wrote
> | When you join two tables which have column names in common and do select
> | both columns from each table than Zope raises an error:
> |
> | Error, exceptions.ValueError: Duplicate column name, ID
> |
> | In this case "ID" was a common column name among the two tables. What
> | happens is logical and expected, Zope cannot deal with two variables with
> | the same name in the same namespace!
> 
> This should probably be handled by zope as it is by SQL: the names of
> the variables become: tablename.columnname (clients.id and columns.id in
> the example below). No ?

It's up to the DB interface - what does it return in the description of
the column. I know it varies from RDBMS to RDBMS. You're safer to just
specify it explicitly with 'as foo', anyway.

(next time people are considering zope mailing list splits - probably
an aqueduct list (or zope-rdbms) would be one to split off... no?)

Anthony