Hello,
As far as I know Sybase is not fully sql 92 compliant.
Im guessing you are looking for something like this, and dont think this exists. Can you mention a little bit more of what you are trying to do, so that we can provide other means to do the same.
The SQL Standard INFORMATION_SCHEMA, also known as the metadata or the system tables, is where you get to look at the definition of your database. It's not just tables (there are domains in it too plus all the predefined character sets / collations / translations), but the interesting things are in these tables, all of which can be accessed using:
SELECT ... FROM INFORMATION_SCHEMA.table-name