Using Data Modeler

ecreating the ssn column settings repeatedly, you can create a domain that containsthe social security number settings and assign that domain as the data type for thecolumn. Refer to Figure 14 on page 31.Creating a domain is optional and is dependent upon the domain support for yourDBMS. When you create a domain, you must first create a domain package as acontainer for your domain. You can assign your domain package to a specific DBMS.Then you can create your domain and assign your domain to the domain package.Assigning your domain to a domain package means your domain will only supportthe data types supported by the domain package’s DBMS. You can also tag yourdomain as server-generated for forward engineering purposes.Figure 14A DomainCreate TablesA table identifies an entity. Each table can contain columns, constraints, triggers, andindexes. Tables are joined together through relationships. A table can belong to onlyone schema, however a schema may contain zero or more tables. You can also indicatethe tablespace name for your table.Whenyoucreateatable,yourtablenamemustbeuniquewithintheschematowhichit belongs, and must meet your specified DBMS’s naming requirements. It isrecommended you use a prefix to distinguish the tables in your data model from theclasses in your object model.Building a New Data Model 31