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11i/2.6 Implement Oracle Workflow
Oracle Training Recover a dropped table using Flashback technology
Examine the description of the STUDENTS table:
STD_ID NUMBER(4)
COURSE_ID VARCHARD2(10)
START_DATE DATE
END_DATE DATE
Which two aggregate functions are valid on the START_DATE column? (Choose two)
A. SUM(start_date)
B. AVG(start_date)
C. COUNT(start_date)
D. AVG(start_date, end_date)
E. MIN(start_date)
F. MAXIMUM(start_date)
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Answer: C, E
Explanation:
It is possible to apply COUNT() and MIN() functions on the column with DATE data type.
Incorrect Answers
A: Function SUM() cannot be used with DATE data type column.
B: Function AVG() cannot be used with DATE data type column.
D: Function AVG() cannot be used with DATE data type column. And function AVG() just has one parameter
X, not two. It averages all X column values returned by the SELECT statement.
F: There is no MAXIMUM() function in Oracle, only MAX() function exists.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 81-85
Chapter 2: Limiting, Sorting, and Manipulating Return Data