This PowerPoint helps students to consider the concept of infinity.
8
1. MS Access How To:
Calculate Queries
Unit 18 Database Design
Extended Diploma in ICT
2. Purpose
• You may need to calculate a result from the
contents of fields
• This is done by building the expression in the
field row of a column
• In this example we will create a query to
calculate the cost of hiring a costume
• This will build on the date query (see How To:
Date Queries)
3. Data source
• The rental rate is in the CostumeHireGroup
table
• We need the Costume table as well to show
the relationships
• Add these tables to the design view of the
date query
4. Add the fields
• Add the CostumeType and DayRate fields to
the query
5. Adding the calculation
• Add the following to the field row in a column
• [Days rented] * [Day rate]
• Access will add an expression name
