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Oracle Database SQL Sample Questions (Q99-Q104):

NEW QUESTION # 99
Examine this query:

Which two methods should you use to prevent prompting for a hire date value when this query is executed?

A. Execute the SET VERIFY ONcommand before executing the query.
B. Use the DEFINEcommand before executing the query.
C. Store the query in a script and pass the substitution value to the script when executing it.
D. Execute the SET VERIFY OFF command before executing the query.
E. Replace '&1'with '&&1'in the query.
F. Use the UNDEFINEcommand before executing the query.

Answer: A,C

NEW QUESTION # 100
Examine the description of the ORDER_ITEMS table:

Examine this incomplete query:
SELECT DISTINCT quantity * unit_price total_paid FROM order_items ORDER BY <clause>; Which two can replace <clause> so the query completes successfully?

A. quantity
B. total_paid
C. quantity * unit_price
D. quantity, unit_price
E. product_id

Answer: C,D

Explanation:
In a SELECT statement with DISTINCT, the ORDER BY clause can only order by expressions that are part of the SELECT list.
A . quantity alone is not sufficient to replace <clause> as it is not included in the SELECT list after DISTINCT.
B . This option can successfully replace <clause> because both quantity and unit_price are used in the SELECT expression, and thus their individual values are valid for the ORDER BY clause.
C . total_paid is an alias for the expression quantity * unit_price, but it cannot be used in the ORDER BY clause because Oracle does not allow aliases of expressions in DISTINCT queries to be used in ORDER BY.
D . product_id is not included in the SELECT list after DISTINCT and thus cannot be used in ORDER BY.
E . The expression quantity * unit_price is exactly what is selected, so it can replace <clause> and the query will complete successfully.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ORDER BY Clause"

NEW QUESTION # 101
Which two statements are true regarding subqueries? (Choose two.)

A. Only two subqueries can be placed at one level.
B. A subquery can be used to access data from one or more tables or views.
C. A subquery in the WHERE clause of a SELECT statement can be nested up to three levels only.
D. The columns in a subquery must always be qualified with the name or alias of the table used.
E. If the subquery returns 0 rows, then the value returned by the subquery expression is NULL.

Answer: B,E

NEW QUESTION # 102
Which two statements are true about Oracle synonyms?

A. A synonym can be created on an object in a package.
B. A synonym can have a synonym.
C. A synonym has an object number.
D. Any user can create a PUBLICsynonym.
E. All private synonym names must be unique in the database.

Answer: A,E

Explanation:
Explanation/Reference: https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_7001.htm

NEW QUESTION # 103
Which three tasks can be performed by DDL statements? (Choose three.)

A. providing an alternative name for a table
B. creating multiple savepoints to enable partial rollback of a transaction
C. preventing data retrieval from a table outside of office hours
D. modifying a table to prevent data that violate certain conditions from being entered in a column
E. preventing any data modification to a table

Answer: A,D,E

NEW QUESTION # 104
......

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Mike Walker Mike Walker

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