Why does no database fully support ANSI or ISO SQL standards?

Question

If I were designing a oil refinery, I wouldn\'t expect that materials from different vendors would not comply with published standards in subtle yet important ways. Pipework, v

Answer 1

Most of them are pretty compliant. But here's the bad news, IMO - standards breed mediocrity. Vendors want you to get locked into their extensions, and there's often good reason to do to nonstandard things. Realistically, how likely are you to dump Oracle for SQL Server, or vice-versa? Unless you build a product that your cusotmers may use against other databases, you as an enterprise are unlikely to swap out DB's. Too painful.