Beginning SQL

Chapter 10
Perhaps you need to view attendance for all active members in Golden State.
SELECT ActiveMemberAttendance.*
FROM ActiveMemberAttendance
WHERE (State = ‘Golden State’)
ORDER BY LastName, FirstName
The preceding results sets (illustrated in Figure 10-3) give you all of the fields from all three base tables,
filtered by attendance and sorted by name and meeting attended. Because you are basing the results on
one or more base queries, the SQL is easy to work with and easy to read. As you can see, you built a base
query that joins all the required tables together. Once you did that, you could easily filter out only the
active members or only the active members in Golden State.
Figure 10-3
Field Views
Another type of view is the field view, which selects all of the records but only some of the fields. For
example, suppose you need to build a list of all members, meeting dates, and meeting addresses.
SELECT LastName, FirstName, MeetingDate, MemberAttended, [Meeting Street],
[Meeting City], [Meeting State]
FROM MemberAttendance
ORDER BY LastName, FirstName
This query provides exactly the fields you requested and does so for every row of the view, ordered by
last name, as shown in Figure 10-4
Figure 10-4
Filtered Windowed Views
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Windowed views display selected columns from selected rows. In other words, they limit the view of data
in both the number of columns displayed as well as the number of rows displayed. The limitation on the
number of columns is created by specifying only a subset of all the columns in the SELECT clause of the
statement. The limitation on the number of rows is created by the WHERE clause, which specifies a subset
of all the rows in the table. Thus, you create a rectangular window into the larger possible data set.