ACC2000: Can't Create Relationship with Multiple-Field Primary Key

ID: Q208353

The information in this article applies to:

Microsoft Access 2000

Novice: Requires knowledge of the user interface on single-user computers.

SYMPTOMS

When you try to create a relationship that enforces referential integrity, and the relationship involves a multiple-field primary key, you may receive the following error:

No unique index found for referenced field of primary table.

CAUSE

The order of the primary key fields in Design view of the table is different from the order of the fields in the PrimaryKey index.

RESOLUTION

There are two ways to work around this error:

Reorder the PrimaryKey fields in the index so that they appear in the same order as they do in Design view of the table.

-or-

Order the field names in the Relationships dialog box to match the order of the field names in the PrimaryKey index.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Problem

Creating the Tables

Create a new table in Design view.

Add the following fields to the table:


   Table:
   ------------------
   Field Name: A
      Data Type: Text
   Field Name: B
      Data Type: Text

Highlight both fields.

On the Edit menu, click Primary Key.

On the View menu, click Indexes.

Change the order of the fields in the PrimaryKey index so that B is in the first row, and A is in the second row:


   Index Name   Field Name   Sort Order
   ------------------------------------
   PrimaryKey   B            Ascending
                A            Ascending

Close the Indexes dialog box.

Save the table as tblOne and close it.

Repeat steps 1 and 2.

Save the table as tblTwo and close it. You do not need to create a primary key index on this table.

Creating the Relationships

Open the Relationships window by clicking Relationships on the Tools menu.

On the Relationships menu, click Show Table. Add the tblOne table and the tblTwo table to the Relationships window.

Highlight fields A and B in the tblOne table by holding down the SHIFT key while you click both fields, and then release the SHIFT key.

Drag the highlighted fields A and B from the tblOne table to the tblTwo table to open the Relationships dialog box.

Select fields A and B from the tblTwo table in the Related Table/Query column, so that the Relationships dialog box looks as follows:


   Table/Query: tblOne   Related Table/Query: tblTwo
   -------------------------------------------------
              A                       A
              B                       B

Click Enforce Referential Integrity.

Click the Create button. Note that the error message appears.

Click Cancel in the Relationships dialog box, and then close the Relationships window. You do not need to save your changes.

REFERENCES

For more information about referential integrity, click Microsoft Access Help on the Help menu, type "What is Referential Integrity" in the Office Assistant or the Answer Wizard, and then click Search to view the topic.

Additional query words: index multiple field primary key prb pra


Keywords          : kberrmsg kbdta RltRef 
Version           : WINDOWS:2000
Platform          : WINDOWS 
Issue type        : kbbug

Last Reviewed: May 13, 1999