2d barcode generator java source code Figure 3-24 Join Properties dialog box in Software

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Figure 3-24 Join Properties dialog box
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Databases: A Beginner s Guide
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In this Try This exercise, you will change the query from Try This 3-9 into an outer join so that all California customers are displayed, regardless of whether they have ordered since 4/1/2006
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Step by Step
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1 You should be starting with the query specification from Try this 3-9, as shown in
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2 To access the Join Properties dialog box (shown in Figure 3-24), double-click
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somewhere in the middle of the line between the two tables displayed on the Query Design panel, or as an alternative, right-click the line As with the Relationships panel, it can be tricky to get the cursor pointer in exactly the right place on the line, but practice and a bit of patience always prevails
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3 In the Join Properties dialog box, select the options Include ALL Records From
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Customers And Only Those Records From Orders Where The Joined Fields Are Equal It is most likely option 2, but if you added the tables to the query in the reverse order, it could have ended up as option 3 Click OK to close the dialog box
4 Since you have a condition on Order Date from the Orders table, you need to change it
to allow for null values For customers who have no orders, the value in the Order Date column will be NULL Add the condition OR IS NULL (which can also be written as Or Is Null) to the condition on the Order Date column
5 Click the Run icon on the ribbon to run your query The completed panel is shown at
the top of Figure 3-25 with the query results shown below Notice the arrow on the line between the two tables that points toward the Orders tables This is the way Access alerts you to the fact that the join is an outer join
6 To get ready for the next exercise, return to the Query Design panel by clicking the
View icon just below the Office button
3: Forms-based Database Queries
Figure 3-25 Try This 3-10 (Outer Joins), query design (top) and query results (bottom)
Try This 3-11
Microsoft Access SQL
SQL is discussed in 4; however, since Microsoft Access automatically generates SQL for queries defined on the Query Design panel, a quick preview of SQL is in order In this Try This exercise, you will display the SQL for the query created in Try This 3-10
(continued)
Databases: A Beginner s Guide
Step by Step
1 You should be starting with a query specification from Try This 3-10, as shown in
Figure 3-25
2 On the Query Design panel, click the arrow below the View icon (under the Office
button) to expand the options Select the SQL View option, as shown in the top of Figure 3-26 Or you could click the SQL icon on the status bar at the lower-right corner of the panel One of the new features of Office 2007 is the addition of zoom and view/ window switching functions to the status bar that appears at the bottom of the various application panels
3 The SQL for the current query will be displayed as shown in the lower part of
Figure 3-26 The SELECT keyword is followed by a list of the columns to be displayed in the query results The FROM keyword is followed by the two tables and their outer join condition And last is the WHERE keyword, followed by the conditions that limit rows to California customers and order dates that are either NULL or 4/1/2006 or later This is a great product feature because you can use it not only to help you learn SQL, but once you know SQL, you can work back and forth between the Query Design View and the SQL View to develop your queries quickly (Incidentally, Access SQL is the least standards-compliant of all the modern RDBMSs because object names can have embedded spaces)
4 To get ready for the next exercise, do the following: a Return to the Query Design panel by clicking the View icon below the Office
button
b Clear all the selected columns and criteria by dragging your mouse pointer over the
slim gray strips above each column (just above the Field: label) The columns will display as black (reverse video) as they are selected Then press DELETE to remove them from the query
c Change the join between the Customers and Orders tables back to an inner join
To do this, double-click the thin part of the line between the two tables displayed on the Query Design panel to display the Join Properties dialog box Then select option 1 and click OK
3: Forms-based Database Queries
Figure 3-26 Try This 3-11 (Microsoft Access SQL), query design (top) and generated SQL query (bottom)
Try This 3-12
Multiple Joins and Calculated Columns
When you need information from more than two tables in the same query result, you can simply add more tables, and therefore more join operations, to the query The beauty of relational databases is that you need not be concerned with which join is best processed first and other such implementation details You can trust the RDBMS to make those decisions for you (continued)
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