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How to Fix Duplicate Tables in Microsoft Access Relationships
Question details
The user needs to resolve an issue in Microsoft Access where modifying referential integrity options produces a conflict due to two copies of the same table being connected to a junction table.
- Product
- Microsoft Access
- Device & OS
- not provided
- Scenario
- Changing relationship options to enable cascade updates or cascade deletes in the Relationships window.
- Observed behavior
- Access displays a visual duplicate of a table and throws a conflict error when attempting to modify the referential integrity settings for that relationship.
Before modifying table relationships, review your primary and foreign keys in Design View to ensure they are properly configured.
Delete Duplicate Relationship and Modify Options
Resolve the referential integrity conflict by deleting the relationship tied to the duplicate alias table, then modifying the original table's relationship settings.
Microsoft Access sometimes creates visual aliases of tables (usually with a '_1' suffix) if the table is added to the Relationships window twice. This can prevent you from applying cascading updates or deletes.
Open your database, navigate to the 'Database Tools' tab, and click 'Relationships'. Look for the table that appears twice in the workspace.
Right-click the relationship line connecting the duplicate table to your junction table, and select 'Delete' from the context menu.
Double-click the relationship line of the original table. In the 'Edit Relationships' dialog box, check the boxes for 'Cascade Update Related Fields' and 'Cascade Delete Related Records', then click 'OK'.
If Access still produces an error grouping tables together, open the affected tables in Design View to verify that your field data types match and there are no hidden conflicting relationships.
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Frequently Asked Questions
Why does Access show a table with a '_1' suffix in the Relationships window?
Access creates a visual duplicate or 'alias' of a table, adding a '_1' suffix, when you add the same table to the Relationships workspace multiple times or when you create multiple complex relationships involving the same tables.
How do I enforce referential integrity in Access?
Open the Relationships window, double-click the relationship line connecting your tables, and check the 'Enforce Referential Integrity' box in the Edit Relationships dialog.
What causes a relationship conflict when enabling cascade updates?
Conflicts usually occur if the existing data in the related tables already violates referential integrity rules, or if duplicate alias tables confuse the database engine when it attempts to apply the cascade logic.
