Ladies and Gentemen,
in a database project I ported an Oracle database definition to
PostgreSQL 7.3.2 as an aside. During this process I found a
couple of incompatibilities in the SQL dialects of both DBMS.
I compiled the following list for whatever it might be good for -
for example to transscribe Oracle DD statements to PostgreSQL DD
statements. Or to enhance PostgreSQL to increase Oracle
compatibility - as far as this might be sensible and desirable.
Or to establish a more comprehensive Oracle/PostgreSQL list.
Since this is nothing I am actively working on I don't expect any
response. However, if it should be useful for you, I'd appreciate
some feedback.
+ At least the following names are a) different and b) PostgreSQL does not understand the Oracle equivalent:
Oracle: PostgreSQL: VARCHAR2 varchar NUMBER int CLOB bytea sysdate current_date
+ CREATE SCHEMA: Sometimes a schema created in PostgreSQL disappears if there is nothing in it.
+ CREATE INDEX: PostgreSQL should allow specifying a namespace for the index, even if the namespace is required to
bethe same as the parent table. This would increase Oracle compatibility.
+ CREATE SEQUENCE: Oracle allows (or requires) "INCREMENT BY" instead of just "INCREMENT". Same for "START WITH"
vs. "START". Oracle allows explicit NOCYCLE and NOCACHE. It also has a keyword ORDER.
+ Indexes and table constraints share the same namespace.
+ Oracle's DISABLE in foreign key specification in table constraint is unknown by PostgreSQL.
+ PostgreSQL does not support Oracle's CREATE PUBLIC SYNONYM
+ PostgreSQL does not support the NUMBER keyword without (...) i.e. something in parenthesis following it.
+ Oracle's SEQ_KATALOGID.nextval should be translated to nextval('SEQ_KATALOGID').
Rainer Klute IT-Consulting GmbH Dipl.-Inform. Rainer Klute E-Mail:
klute@rainer-klute.deKörner Grund 24 Telefon: +49 172 2324824
D-44143 Dortmund Telefax: +49 231 5349423
