[libreoffice-users] Re: I have a question

Le 28/07/12 14:17, Lynne Stevens a écrit :

Hi Lynne,


> *How do I check for duplicates in a data base using another data base ?

By "another data base", do you mean :

(a) another ODB file ?

(b) another type of database manager, e.g. Access vs Calc, or MySQL vs
Access, or even Access vs Access ?

(c) another table in the same ODB file or in the same database schema
managed by a unique database manager ?

(d) any or all of the above combined ?

As you can see, the possibilities belie what would appear to be a
seemingly simple question.


Andreas has answered (c) for you, i.e. where both tables are in the same
database schema.


There is no simple way to compare the contents of 2 HSQLDB/ODB files,
other than extracting the contents from one and importing it into the
other as a temporary or new table and then comparing the table results
from within the single ODB file using a JOIN query.

As for (b) LO Base does not allow you to adress two separate database
schema as far as I know from within a single query. I heard tell once
that it might be possible with Access tables being read by LO if an ODBC
connection was being used, and this only would work on Windows. Not
having tried it, I can't say whether it is true or not.


If what you are aiming for is indeed cross-schema queries in order to be
able to compare, this has been a requested (and never implemented)
feature in OpenOffice.org for many years.



Alex


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