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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
Single-row functions, explored in Chapters 4 and 5, return a single value for each row in a set of results. Group or aggregate functions operate on multiple rows. They are used to count the number of rows or to find the average of specific column values in a dataset. Many statistical operations, such ...

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