Release 10.1A: OpenEdge Data Management:
DataServer for Microsoft SQL Server

> ## User-defined data types

> MS SQL Server allows you to define your own data types that map to native MS SQL Server data types. When the DataServer reads the schema information for a user-defined data type, it reads the MS SQL Server base data type and maps it to the equivalent OpenEdge data type. Suppose, for example, that you create a data type named `phone_number` and map it to the `char` data type. In the schema holder, the DataServer represents your `phone_number` data type as a `CHARACTER` data type. If you make any changes to a user-defined data type, you must update the schema holder to reflect those changes.

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