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This class begins our look at Advanced Query
Techniques. We will start by creating a Sales Log system.
We'll build a sales log table where we will store basic order
information, like unit price, description, quantity, etc.
Next, we'll create a Sales Log Query which will
use Calculated Fields to figured out the extended price by
multiplying the unit price and quantity. We will also learn how to
calculate sales tax based on whether or not each sale is taxable -
cool stuff, using the IIF() function we learned about earlier.
We'll also learn how to round off values inside queries.
Next, we'll make a Sales Log Form where you
can enter in your sales information, pick your customer from a combo
box, and so on. There's a real cool trick on this form - one that people
have been emailing me to show them for a while... how to put a Total
in the form footer!
We'll learn about different types of Query
Joins, like Inner and Outer Joins. This is necessary if you want to,
for example, get a list of all of your customers with contact history -
whether or not they have contacts; or all sales whether or not there is
an associated customer record. This is very powerful stuff.
We'll also talk a lot more about Global
Relationships, Referential Integrity, Cascade Deleting
records, and more. This is a great class, and it's just the first in our
series of Advanced Query lessons.
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