Database design for database-agnostic applications

Question

What do I have to consider in database design for a new application which should be able to support the most common relational database systems (SQL Server, MyS

Answer 1

The first thing to consider is if the cost of doing it independent is lower that depend on database. I think some times is important for some products that whant to give choice to customers, but they are loosing a lot of database features (it means code to be written again).

For big customers (big applications) they have to be fully dependent to database. For little customizes , is reallly a trouble to have an Oracle XE and a MySQL on one server (or two).

Really, I prefer to use more than one database and that the application knows which database is that an "abastract" code.