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

According to the HSQLDB manual, it is the most standards compliant RDBMS.

• Almost all syntactic features of SQL-92 up to Advanced Level are supported
• SQL:2008 core and many optional features of this standard