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7 In the Employees table (on the left), scroll down until the Manager ID column is
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visible Click its name and (while holding down the mouse button) drag-and-drop the name on to the ID column in the Employees_1 table This tells Access how to join the Employees table to itself The table on the left represents the employees and the one on the right is where you will find each employee s manager Don t be overly concerned if this still seems confusing we will revisit recursive relationships in subsequent chapters in this book
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8 You want Andrew Cencini s row to display, but since he has no manager in the table,
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you need to change the join to an outer join to see his row Double-click in the line between the two tables, select Option 2 in the Join Properties dialog box, and click OK
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9 From the Employees table, select the ID, First Name, Last Name, and Job Title
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10 From the Employees_1 table, select the Last Name column by double-clicking its name 11 At this point, you have two columns in the query named Last Name You need to
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change one of them to avoid confusion and to comply with the RDBMS principal that every column has a unique name In the Last Name column from the Employees_1 table (the rightmost column in the query specification), click just to the left of the column name and enter Manager:, which assigns an alias name to the query column
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12 Click the Run icon on the ribbon to run your query The completed panel is shown
at the top of Figure 3-31 with the query results shown below Your results should be
3: Forms-based Database Queries
Figure 3-31 Try This 3-14 (Self-Joins), query design (top) and query results (bottom)
similar, but since you didn t specify a sort order, the order of rows in your results may be different
13 To complete this exercise, close the Query Design panel by either clicking on the Close
box in the upper-right corner of the panel, or right-clicking the tab that shows the query name (most likely Query1) and choosing Close When asked about saving the query, click NO You can then close Microsoft Access if you want (continued)
Databases: A Beginner s Guide
Try This Summary
In the 14 Try This exercises in this chapter, you explored Microsoft Access queries in a manner intended to demonstrate the basic features that you will use the most Obviously there are many more features to explore But it is time to move on to SQL, the topic of the next chapter
3 Self Test
Choose the correct responses to each of the multiple-choice and fill-in-the-blank questions Note that there may be more than one correct response to each question
1 A forms-based query language A Was first developed by IBM in the 1980s B Describes how a query should be processed rather than what the results should be C Resembles SQL D Uses a GUI (graphical user interface) E Was shown to be clearly superior in controlled studies 2 The object types in Microsoft Access that relate strictly to database management
(as opposed to application development) are
A Tables B Queries C Forms D Macros E Modules 3 When a table is deleted from the Microsoft Access Relationships panel, what happens next A It is immediately deleted from the database B It remains unchanged in the database and is merely removed from the
Relationships panel
3: Forms-based Database Queries
C It remains in the database, but all data rows are deleted D Relationships belonging to the table are also deleted 4 Relationships on the Microsoft Access Relationships panel represent ____________ in
the database
5 A column in the results of a Microsoft Access query can be formed from A A table column B A query column C A constant D A calculation E All of the above 6 When a query with no criteria included is executed, the result is A An error message B No rows being displayed C All the rows in the table being displayed D None of the above 7 When sequencing (sorting) of rows is not included in a database query, the rows
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