We're mostly a SQL Server shop, but we have a client on Oracle and we're exploring Postgres as well. In the enterprise realm (e.g. MS) you typically stick with

We're mostly a SQL Server shop, but we have a client on Oracle and we're exploring Postgres as well. In the enterprise realm (e.g. MS) you typically stick with the enterprise db systems, but not always--that's why we're looking into Postgres. But to be honest, our clients that have invested in the MS stack are already well-versed in SQL Server. It's rare when the entire "picture" can justify open source stuff when they've already invested in a proprietary stack.