These constants are used with the Attributes property to determine the characteristics of specific rdoColumn objects.
| Constant | Value | Description |
| rdFixedColumn | 1 | The column size is fixed (default for numeric columns). For character columns this indicates the column is defined as rdTypeCHAR. |
| rdVariableColumn | 2 | The column size is variable (character columns only). Indicates the column is defined as rdTypeVARCHAR. |
| rdAutoIncrColumn | 16 | The column value for new rows is automatically incremented to a unique Long integer that can't be changed. |
| rdUpdatableColumn | 32 | The column value can be changed. |
| rdTimestampColumn | 64 | The column is defined as a system-managed TimeStamp. |