Oracle Training Perform database recovery following a RESETLOGS operation - mcsetrainingonline.com

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Oracle Training Perform database recovery following a RESETLOGS operation

Which four statements correctly describe functions that are available in SQL? (Choose four)

A. INSTR returns the numeric position of a named character.
B. NVL2 returns the first non-null expression in the expression list.
C. TRUNCATE rounds the column, expression, or value to n decimal places.
D. DECODE translates an expression after comparing it to each search value.
E. TRIM trims the heading of trailing characters (or both) from a character string.
F. NVL compares two expressions and returns null if they are equal, or the first expression of they are not
equal.
G. NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.

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Answer: A, D, E, G

Explanation:
INSTR returns the numeric position of a named character. DECODE translates an expression after comparing it
to each search value. TRIM trims the heading of trailing characters (or both) from a character string. NULLIF
compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
Incorrect Answers
B: This statement is not correct. The following is the Syntax for NVL2 function: NVL2(expr1, expr2, expr3). If
expr1 is not null, NVL2 returns expr2. If expr1 is null, NVL2 returns expr3.
C: Command TRUNCATE is used to remove all row data from the table, while leaving the definition of the
table intact, including the definition of constraints and any associated database objects as indexes, constraints,
and triggers on the table.
F: NVL returns second parameter value if first one is NULL.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 67-73
Chapter 2: Limiting, Sorting, and Manipulating Return Data