# Aurora PostgreSQL Limitless Database reference
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We provide the following reference topics for Aurora PostgreSQL Limitless Database.

**Topics**
+ [Supported and unsupported Data Definition Language (DDL) SQL commands](limitless-reference.DDL-support.md)
+ [DDL limitations and other information for Aurora PostgreSQL Limitless Database](limitless-reference.DDL-limitations.md)
+ [Supported and unsupported Data Manipulation Language (DML) and query processing SQL commands](limitless-reference.DML-support.md)
+ [DML limitations and other information for Aurora PostgreSQL Limitless Database](limitless-reference.DML-limitations.md)
+ [Variables in Aurora PostgreSQL Limitless Database](limitless-reference.variables.md)
+ [DB cluster parameters in Aurora PostgreSQL Limitless Database](limitless-reference.DBCparams.md)