Returns a value that indicates the number of unique values for the Index object that are included in the associated table (Microsoft Jet workspaces only).
Return Values
The return value is a Long data type.
Remarks
Check the DistinctCount property to determine the number of unique values, or keys, in an index. Any key is counted only once, even though there may be multiple occurrences of that value if the index permits duplicate values. This information is useful in applications that attempt to optimize data access by evaluating index information. The number of unique values is also known as the cardinality of an Index object.
The DistinctCount property won't always reflect the actual number of keys at a particular time. For example, a change caused by a rolled back transaction won't be reflected immediately in the DistinctCount property. The DistinctCount property value also may not reflect the deletion of records with unique keys. The number will be accurate immediately after you use the CreateIndex method.