virtual (COMPUTED BY) columns?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi.

These fields do not use any disk space, as the data in them is
derived on the fly.

For example:
CREATE TABLE T_EXAMPLE (
SOME_DATE DATE,
JDATE COMPUTED BY EXTRACT(JULIAN FROM SOME_DATE)
);

A work-around is to create a function, and reference it in every
query, but storing them in the table definition is the "tidy",
low-maintenance way to do it.

Thanks
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFFvM59S9HxQb37XmcRAtFvAKC51YTKLLy+v+0TXMhGIyX2PmO2EQCfW8gy
yIn2EBd5gR82/Hf+j5CB+rQ=
=4Csd
-----END PGP SIGNATURE-----