A database modeling tool that creates entity relationship diagrams, star schemas, relational schemas, and SQL DDL queries. ERDPlus, a web-based database modeling software, allows you to quickly and easily create Entity Relationship Diagrams. Uses most modern RDBMS tools, including Oracle, MySQL and Microsoft SQL Server, Teradata and IBM DB2, Microsoft Access, as well as PostgreSQL, Teradata and IBM DB2. The notation allows you to draw regular and weak entities. It also supports various types of attributes (regular and unique, multi-valued and derived, composite, optional, and optional). This tool allows you to quickly create foreign keys and referential integritylines with a few click-point-connect actions. This makes it easier and faster to create relational schemas. This notation differentiates dimension tables from fact tables by using thicker frames around fact tables.