为ODBC数据源编写SQL查询。

I usually write SQL queries for SQL Server and MySQL but I just recently started to work with an ODBC data source that points to a Progress database. My question is where can I find a good syntax reference for writing SQL for an ODBC data source. I need to know what I can or can't do but there seems to be no guides I can find out on the internet.I usually write SQL queries for SQL Server and