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Oracle Applications 11i Certification Training
Prompt the user for a number value at run time by using a substitution variable
In which situation should you use outer join query?
A. The employee table has two columns that correspond.
B. The employee and region tables have corresponding columns.
C. The employees and region tables have no correspondence.
D. The employee table column correspond to the region table column contains null
values for rows that need to be displayed.
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Answer: D
Explanation:
Answer D is correct because to show all data including null values for rows that need to
be displayed you need to use OUTER join between two tables. Notice the special (+)
character string called the outer join operator that forms the join.
Incorrect Answers:
A: You don't need to use outer join if the employee table has two columns that
correspond.
B: You don't need to use outer join if the employee table and region table have columns
that correspond.
C: You don't need to use outer join if the employee table and region table have no
columns that correspond.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 53-55
Chapter 2: Advanced Data Selection in Oracle