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OCA Oracle Database 12c SQL Fundamentals I Exam Guide (Exam 1Z0-061), 2nd Edition by Roopesh Ramklass

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CERTIFICATION OBJECTIVES
   image    Two-Minute Drill
All SELECT statements return a set of rows. The set operators take as their input the results of two or more SELECT statements and from these generate a single result set. This is known as a compound query. Oracle provides three set operators: UNION, INTERSECT, and MINUS. UNION can be qualified with ALL. There is a significant deviation ...

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