May 16, 2021 MS Access
In MS Access, expressions are like formulas in Excel. T his includes multiple elements that can be used individually or in combination to produce results. Expressions can include operators, constants, functions, and identifiers.
Expressions can be used to perform a variety of tasks, from retrieving the value of a control or providing criteria to a query, creating calculated controls and fields, or defining the group level of a report.
In this chapter, we'll focus on creating a very specific expression, called a calculated expression. ed.
We now have a new Access database that contains more data to calculate.
Let's try to understand this with an example. We'll retrieve some information from various tables - tblCustomers, tblOrders, tblOrdersDetails, and tblBooks and check the various fields.
Now let's run the query and you'll see the following results.
We want a very simple calculation of the understation, which will take the number of books, multiplied by the retail price of the book. I t is a good idea to call the expression of the field with each expression or any expression that starts with a name. L et's call it a synth.
Full expression (subtrometer: sblOrdersDetails)! [ QTY] * [tblBooks]! ( RetailPrice) includes the table name, the first tblOrdersDetails in square brackets, because this is our quantity field. ks.
Let's try to run the query, and you'll see the count field at the end.
For example, we want to calculate our sales tax. In the query grid, we'll do exactly the same thing we did before, and this time we'll call it a field simple tax, multiplied by a subtring of 9 percent.
Let's run the query again, and you'll see the new tax field at the end.