If you are using Access 2016, do the following. Add a field to the Client table named AvailableCredit. Set the field to currency. Create a data macro associated with the After Update event for the Client table. When a user updates the Balance field, the macro should subtract the new balance from the credit limit and place that value in the AvailableCredit field. Create a data macro associated with the After Delete event for the OrderLine table. When a user deletes a record because it is complete or cancelled, the macro should look up the order number in the WorkOrders table and delete it there as well. Use the For Each Record in the WorkOrders table. Hint: You can use the OLD keyword in the Where Condition: [Old].[OrderNum] = [WorkOrders].[OrderNum]. Test the data macro by deleting a record from the OrderLine table and ensuring that the record also is deleted from the WorkOrders table.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
- If you are using Access 2016, do the following.
- Add a field to the Client table named AvailableCredit. Set the field to currency.
- Create a data macro associated with the After Update event for the Client table. When a user updates the Balance field, the macro should subtract the new balance from the credit limit and place that value in the AvailableCredit field.
- Create a data macro associated with the After Delete event for the OrderLine table. When a user deletes a record because it is complete or cancelled, the macro should look up the order number in the WorkOrders table and delete it there as well. Use the For Each Record in the WorkOrders table. Hint: You can use the OLD keyword in the Where Condition: [Old].[OrderNum] = [WorkOrders].[OrderNum]. Test the data macro by deleting a record from the OrderLine table and ensuring that the record also is deleted from the WorkOrders table.
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