Access Invoice Database' title='Access Invoice Database' />Microsoft Access Database Templates. Free Ms Access Invoice DatabaseMicrosoft Access Database Architecture Taking Time into Account. Provided by Luke Chung, President of FMS, Inc. When designing an application and its tables, its very important to capture the time dimension and determine how data should be. While theres a natural tendency to keep data normalized so that the same information is. What Needs to be Preserved Over Time A common example is the use of a Customer table where a Customer ID field identifies the record, which contains the persons name, address, etc. An. invoice table could include a Customer ID that identifies the customer. While this approach works if the address changes the Customer record is. If a backup of the original customer record or the original customer data is not maintained with the original invoice, that information is lost. While some information may not be worth keeping, old phone numbers for example, other pieces could be critical. For instance, a list of products. I always like how in FreshBooks to edit invoices you literally just click and interact directly with a web page that looks like an invoice. I got to thinki. MS Access Database Templates with source code designed to save you time and help you learn download a 15day free trial. Thinking about what is important and is not is a crucial part of the design process, and very difficult to fix later. Making Sure Data Normalization Doesnt Lose Historical Data. One way to address this is to make a copy of the original customer record in the invoice table. This essentially takes a snapshot of the data. Another approach is to presume the data does not change that often and when you reprint the invoice you want to show the new address, not the old. If thats the case, this could be solved by simply keeping a shadow Customer table, so that any changes to the customer record or relevant. If historic information is required, it would be a simple search in the table to find it. Shadow Tables. A shadow table is essentially the same as the original table with some small differences It has a its own primary key field Auto. Number. This allows it to store multiple versions of the same. ID from your master table without creating a unique primary key violation. Rfactor Pc Game. All secondary indexes that require uniqueness need to have that constraint removed. Any extra fields you may want to add to track the activity e. Eliminate any field validation requirements, null prevention, etc. We want to save all changes here. Student%20Advisor/CustomerAppt.JPG' alt='Free Access Invoice Database Template' title='Free Access Invoice Database Template' />We dont care about validation in this table. Thats something that needs to be handled where the user makes their edits. One can then create a simple parameterized query that takes all the fields from the master table and inserts. Invoice. ID. Then, but adding VBA code to forms After. Update event, the query can be invoked with the current records ID to copy the record to the shadow table. In SQL Server, a trigger can be created for each table to automatically store a copy in another table. This is. more robust since any time the data is modified, this audit record is created. In Access using Jet. Additional Resources.