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This chapter is from the book

This chapter is from the book

Alison Balter's Mastering Microsoft Office Access 2003Alison Balter's Mastering Microsoft Office Access 2003

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This chapter is from the book

This chapter is from the book

Alison Balter's Mastering Microsoft Office Access 2003Alison Balter's Mastering Microsoft Office Access 2003

Learn More Buy

The primary benefit of relationships is the data integrity they provide. Without the establishment of relationships, users are free to add records to child tables without regard to entering required parent information. After referential integrity is established, you can enable Cascade Update Related Fields or Cascade Delete Related Records, as appropriate, which will save you quite a bit of code in maintaining the integrity of the data in your system. Most relational database management systems require that you write the code to delete related records when the user deletes a parent record or to update the foreign key in related records when the user modifies the primary key of the parent. By enabling the Cascade Update and Cascade Delete check boxes, you are sheltered from having to write a single line of code to perform these tasks when they are appropriate.

NOTE

SQL Server 2000 offers Cascade Update and Cascade Delete features similar to those found in Microsoft Access. This means that you no longer need to write your own T-SQL statements when it is appropriate to implement Cascade Update and Delete functionality.

Access automatically carries relationships into your queries. This means that each time you build a new query, it automatically establishes the relationships between the tables within the query, based on the relationships you have set up in the Relationships window. Furthermore, each time you build a form or report, Access uses relationships between the tables included on the form or report to assist with the design process. Whether you delete or update data using a datasheet or a form, all referential integrity rules automatically apply, even if you establish the relationship after you build the form.

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Other Collection and Use of Information


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Marketing


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Sale of Personal Information


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Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


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Links


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Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020