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Excel tables are read-only in ArcGIS as well as read-only in Excel when you have a workbook open in ArcGIS.
Field names are derived from the first row in each column of the worksheet. You can view the properties, set aliases for the field names, and set field visibility on the Fields tab of the table's Properties dialog box.
Excel does not enforce field types for values during data entry like standard databases do. Therefore, the field type specified in Excel is not used in determining the field type exposed in ArcGIS. Instead, field type in ArcGIS is determined by a scan of the values in the first eight rows for that field. If the scan finds mixed data types in a single field, that field will be returned as a string field and the values will be converted to strings.
Numeric fields are converted to the Double data type in ArcGIS.
Excel tables behave like other tables that don't have an ObjectID field. This means you will be unable to edit, perform relates, or make selections on the map. (Note: ArcMap does not convert any column from Excel into an ArcGIS ObjectID field. For example, a numeric column named "OID" or an autonumber field will be a Double in ArcMap.)
Excel file support in ArcGIS uses Microsoft OLE DB Provider for Jet 4.0 and its supporting Excel Indexed Sequential Access Method (ISAM) driver. For more information on the Microsoft OLE DB Provider for Jet 4.0 and its supporting Excel ISAM, see Microsoft KB article 326548.
You cannot create new Excel files or export records to an Excel file in ArcGIS.
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