title: Database Engines and ANSI SQL Compliance
body: <p>I've been searching for half an hour and can't find any resources stating what level of the SQL ANSI standard is supported on various database engines.</p>
  
  <p>It looks like some level of support is provided by most engines, but I'd like to know <em>exactly</em> what level is officially supported.</p>
  
  <p>I'm primarily interested in MySQL, PostgreSQL, SQL Server, and Oracle.</p>
  
  <p>EDIT: PostgreSQL has a great page on compliance, exactly what I was looking for regarding the other engines: <a href="http://www.postgresql.org/docs/current/interactive/features.html" rel="noreferrer">http://www.postgresql.org/docs/current/interactive/features.html</a></p>