An incremental field assigns a unique sequential number for each record added to a table. The starting value is 1 and the step value is also 1. When you add the first record to the table, the incremental field is set to the start value. When you add additional records, the incremental field will automatically be filled in with the value from the last entered record plus the step value. Even if you subsequently delete records from the table, old values are not re-used. This makes an incremental field ideal for use as a primary key field.
The formatting properties available on the General page are:
Caption (enter a caption to replace the field name above the column in Table View - see Captions)
Index (choose from Primary Key, Indexed, Indexed (Unique), No Index). See Indexes and primary keys
The formatting properties available on the Format page are the same as for Numeric fields (see the Format page in Numeric)