UniqueRecords Property
Applies To
Action query, Select query.
Description
You can use the UniqueRecords property to specify whether to return only unique records based on all fields in the underlying data source, not just those fields present in the query itself.
Note The UniqueRecords property applies only to append and make-table action queries and select queries.
Setting
The UniqueRecords property uses the following settings.
| Setting | Description |
|
| Yes | Doesn't return duplicate records. |
| No | (Default) Returns duplicate records. |
You can set the UniqueRecords property in the query's property sheet or in SQL view of the Query window.
Note You set this property when you create a new query by using an SQL statement. The DISTINCTROW predicate corresponds to the UniqueRecords property setting. The DISTINCT predicate corresponds to the UniqueValues property setting.
Remarks
You can use the UniqueRecords property when you want to omit data based on entire duplicate records, not just duplicate fields. Microsoft Access considers a record to be unique as long as the value in one field in the record differs from the value in the same field in another record.
The UniqueRecords property has an effect only when you use more than one table in the query and select fields from the tables used in the query. The UniqueRecords property is ignored if the query includes only one table.
The UniqueRecords and UniqueValues properties are related in that only one of them can be set to Yes at a time. When you set UniqueRecords to Yes, for example, Microsoft Access automatically sets UniqueValues to No. You can, however, set both of them to No. When both properties are set to No, all records are returned.
See Also
ALL, DISTINCT ROW, TOP predicates ("SQL Language Reference"), UniqueValues property.
Example
The query in this example returns a list of customers from the Customers table who have at least one order in the Orders table.
Customers Table
| Company name | Customer ID |
|
| Ernst Handel | ERNSH |
| Familia Arquibaldo | FAMIA |
| FISSA Fabrica Inter. Salchichas S.A. | FISSA |
| Folies gourmandes | FOLIG |
Orders Table
| Customer ID | Order ID |
|
| ERNSH | 10698 |
| FAMIA | 10512 |
| FAMIA | 10725 |
| FOLIG | 10763 |
| FOLIG | 10408 |
The following SQL statement returns the customer names in the following table:
SELECT DISTINCTROW Customers.CompanyName, Customers.CustomerID
FROM Customers INNER JOIN Orders
ON Customers.CustomerID = Orders.CustomerID;
| Customers returned | Customer ID |
|
| Ernst Handel | ERNSH |
| Familia Arquibaldo | FAMIA |
| Folies gourmandes | FOLIG |