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Oracle Database SQL Sample Questions (Q234-Q239):

NEW QUESTION # 234
You execute this command:
TRUNCATE TABLE depts;
Which two are true?

A. It always retains the space used by the removed rows
B. A ROLLBACK statement can be used to retrieve the deleted data.
C. It drops any triggers defined on the table.
D. It retains the integrity constraints defined on the table.
E. It retains the indexes defined on the table.
F. A Flashback TABLE statement can be used to retrieve the deleted data.

Answer: D,E

NEW QUESTION # 235
Examine the commands used to create department details and course details:

You want to generate a list of all department IDs that do not exist in the COURSE_DETAILS table. You execute the SQL statement:

What is the outcome?

A. It executes successfully and displays the required list.
B. it fails because the Join type used is Incorrect
C. It executes successfully but displays an incorrect list.
D. It fails because the ON clause condition is not valid

Answer: B

NEW QUESTION # 236
In which three situations does a new transaction always start?

A. When issuing a DML statement after a DML statement filed in the same session.
B. When issuing a CREATE TABLE statement after a SELECT statement was issued in the same session
C. When issuing the first Data Manipulation Language (OML) statement after a COMMIT or ROLLBACK statement was issued in the same session
D. When issuing a CREATE INDEX statement after a CREATE TABLE statement completed unsuccessfully in the same session
E. When issuing a SELECT FOR UPDATE statement after a CREATE TABLE AS SELECT statement was issued in the same session
F. When issuing a TRUNCATE statement after a SELECT statement was issued in the same session

Answer: C,E,F

Explanation:
Substitution variables in Oracle are used to replace a value dynamically during the execution of SQL statements. The behavior of these variables is well-documented:
C . A substitution variable prefixed with & always prompts only once for a value in a session: This is true. In a session, when you use a single ampersand (&), SQL*Plus or SQL Developer will prompt for the value the first time the variable is encountered. The value for this variable will then be reused for the remainder of the session unless it is redefined.
D . A substitution variable can be used with any clause in a SELECT statement: Substitution variables can be placed in any part of a SQL statement, including the SELECT, WHERE, GROUP BY, ORDER BY, etc. They are not limited to any specific clause.
Reference:
Oracle SQL*Plus User's Guide and Reference, which discusses substitution variables.

NEW QUESTION # 237
You execute the following commands:

For which substitution variables are you prompted for the input?

A. Only 'hiredate'
B. Both the substitution variables 'hiredate' and 'mgr_id
C. Only 'mgr_id'
D. None, because no input required

Answer: B

NEW QUESTION # 238
Examine the description of the EMPLOYEES table:

Which statement will execute successfully, returning distinct employees with non-null first names?

A. SELECT first_ name, DISTINCT last_ name FROM employees WHERE first_ name < > NULL;
B. SELECT first_ name, DISTNCT last_ name FROM employees WHERE first_ name IS NOT NULL;
C. SELECT DISTINCT * FROM employees WHERE first_ name IS NOT NULL;
D. SELECT Distinct * FROM employees WHERE first_ name < > NULL;

Answer: C

NEW QUESTION # 239
......

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1z0-071 Passguide & 1z0-071 Latest Test Vce

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Oracle Database SQL Sample Questions (Q234-Q239):

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