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OCA Oracle Database 11g: SQL Fundamentals I Exam Guide (Exam 1Z0-051) by Roopesh Ramklass, John Watson

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CERTIFICATION OBJECTIVES
8.01    Define Subqueries
8.02    Describe the Types of Problems That the Subqueries Can Solve
8.03    List the Types of Subqueries
8.04    Write Single-Row and Multiple-Row Subqueries
  Image      Two-Minute Drill
Q&A    Self Test
 
The previous six chapters have dealt with the SELECT statement in considerable detail, but in every case the SELECT statement has been a single, self-contained command. This chapter is the first of two that show how two or more SELECT commands can be combined into one statement. The first technique ...

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