You might use a one-to-one relationship to divide a table with many fields, to isolate part of a table for security reasons, or to store information that applies only to a subset of the main table. This type of relationship is not common, because most information related in this way would be in one table. In a one-to-one relationship, each record in Table A can have only one matching record in Table B, and each record in Table B can have only one matching record in Table A. In a one-to-one relationship each record in one table has at most one related record in another table. The relationship is used to cross reference information between tables. In general, tables can be related in one of three different ways: one-to-one, one-to-many or many-to-many. In a relational database (Access), the data in one table is related to the data in other tables. Connect to a Microsoft Access database (.898What are relationships in Microsoft Access ?.Connect to a Microsoft Access database (.mdb) in ArcGIS.Formatting a table in Microsoft Access for use in ArcGIS.Understanding how to use Microsoft Excel files in ArcGIS.Without using OLE DB, ArcGIS cannot directly read or write to the new Microsoft Access format this includes accessing accdb files directly through the Add Data dialog box. Microsoft Office 2007 introduced a new Microsoft Access database format, accdb, which is the new default format in Access 2007 when saving or creating a database. Editing the geodatabase in Access may cause those tables to become out of sync and corrupt the geodatabase. When editing a feature class in ArcGIS, ArcGIS keeps track of changes in all the underlying tables. Personal geodatabases contain multiple underlying tables that provide information for a single feature class.The Access database format does not support geographic features.The limitation of Microsoft Access as an application to edit personal geodatabases is that Access was not designed to use or understand the ESRI functionality behind the personal geodatabase format. This can corrupt the geodatabase and cause data loss. mdb, you should not open or modify the tables in a personal geodatabase inside Microsoft Access. Although a personal geodatabase is stored as an Access.
Similarly, you should only edit a personal geodatabase in ArcGIS. To maintain data integrity, you should only modify an Access database in Access. OLE DB is a standard for sharing data between applications, enabling you to view the Access database in ArcMap. You can use tables from a Microsoft Access database in ArcMap through an OLE DB connection. Understanding how to use Microsoft Access files in ArcGIS
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