unable to enforce referential integrity in Access - Stack Overflow
Microsoft Access can't create this relation and enforce referential integrity. I have two tables in MS Access I have the two tables linked by a common field. I am asking this question from one of our users. I am not really up to date on Access. It is Access (32bit) on Windows 7 pro. Any help or. In an Access desktop database, you can create a relationship in the Relationships To enforce referential integrity for this relationship, select the Enforce.
To drag multiple fields, press the Ctrl key, click each field, and then drag them. The Edit Relationships dialog box appears. Verify that the field names shown are the common fields for the relationship.
Enforcing Referential Integrity : MS Access
If a field name is incorrect, click on the field name and select the appropriate field from the list. To enforce referential integrity for this relationship, select the Enforce Referential Integrity box.
When you are finished in the Relationships window, click Save to save your relationship layout changes.
Access draws a relationship line between the two tables. If you selected the Enforce Referential Integrity check box, the line appears thicker at each end. This means that the Indexed property for these fields should be set to Yes No Duplicates.
If both fields have a unique index, Access creates a one-to-one relationship. This means that the Indexed property for this field should be set to Yes No Duplicates. The field on the many side should not have a unique index. It can have an index, but it must allow duplicates.
Microsoft can't create this relationship and enforce referential integrity error
When one field has a unique index, and the other does not, Access creates a one-to-many relationship. After completing all this in the Relationships window, tap to the Save option just to save your relationship layout changes.
Referential integrity is one concept of relational database, which states that table relationship should always be consistent. Alternatively, it also means that any foreign key fields must match with the primary key which references by the foreign key. Thus any changes done in the primary key must be applied to all foreign key. Likewise same restriction is applies to the foreign keys in that any update must be circulated to the primary parent key.
Example for Referential Integrity: Consider a bank database having the two tables: This contains the basic bank account data like its account type, account holder, account creation date and withdrawal limits. Well this column is special one because its values are not newly created. So that there is no record in your access database that references other records which no longer exists.
User can enforce the Reverential Integrity by enabling it for table relationship. Once it gets enforced, access rejects any operations which violate referential integrity for that table relationship. Access also rejects the updates that change the target of references and also deletions which remove the target of references.
In order to have access propagates referential updates and deletions.Office 2010 Class #43: Access One To Many Relationship Between Tables
So that all the related rows get changed accordingly, check out the section which Set the cascade options. The referential integrity works only when the following condition matches: Check the Enforce Referential Integrity box. This will enforce referential integrity between the tables. If you get an error message, it's because your tables and fields don't meet all the required conditions listed on the previous page. There are two other very important boxes in the Edit Relationships dialog box: Cascade Update Related Fields: When you change data in the main field of one table, Access will automatically update the matching data in the related table.
Cascade Delete Related Records: When you delete a record in the main table, Access will automatically delete any matching records in the related table. These are both very powerful optionsthink twice before using them. Now you can save the changes to the relationship.
Click Create to create the relationship between the tblCustomers and tblCustomerTours tables. Access creates the relationship between the two tables and enforces between them. Notice that the join line between the tblCustomers table and the tblCustomerTours table looks a little different.