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Oracle Database SQL Sample Questions (Q196-Q201):

NEW QUESTION # 196
Which three statements are true about time zones, date data types, and timestamp data types in an Oracle database?

A. A TIMESTAMP data type column contains information about year, month, and day
B. A TIMESTAMP WITH LOCAL TIMEZONE data type column is stored in the database using the time zone of the session that inserted the row
C. The CURRENT_TIMESTAMP function returns data without time zone information
D. The SESSIONTIMEZONE function can return an offset from Universal Coordinated Time (UTC)
E. The DBTIMEZONE function can return an offset from Universal Coordinated Time (UTC)

Answer: B,D,E

Explanation:
A: True. The DBTIMEZONE function returns the database's time zone offset from UTC (Coordinated Universal Time). In Oracle 12c, DBTIMEZONE can return the time zone of the database in terms of a region name or as a numeric offset from UTC. This is stated in the Oracle documentation for managing time zones.
B: True. TIMESTAMP WITH LOCAL TIME ZONE is a data type that adjusts the data stored in the database to the time zone of the session that is querying or inserting the data. When data is stored, Oracle converts it from the session time zone to UTC, and upon retrieval, it converts it back to the session time zone. This is a feature designed to allow the same data to be viewed in different time zones automatically, making it highly useful in global applications.
D: True. SESSIONTIMEZONE function returns the time zone offset of the current session from UTC. This is useful for understanding and managing data conversions in applications that are used across different time zones. The time zone can be displayed as an offset from UTC or as a named region depending on the environment settings.

NEW QUESTION # 197
You want to write a query that prompts for two column names and the WHERE condition each time it is executed in a session but only prompts for the table name the first time it is executed.
The variables used in your query are never undefined in your session?
Which query can be used?

Answer: B

NEW QUESTION # 198
Which three statements are true about Data Manipulation Language (DML)?

A. delete statements can remove multiple rows based on multiple conditions.
B. DML statements require a primary key be defined on a table.
C. insert statements can insert nulls explicitly into a column.
D. insert into. . .select. . .from statements automatically commit.
E. update statements can have different subqueries to specify the values for each updated column.

Answer: A,C,E

Explanation:
Data Manipulation Language (DML) operations in Oracle 12c are critical for handling data within tables. Here's the validity of each statement based on Oracle SQL documentation:
Option A: True. The DELETE statement can remove multiple rows from a table and supports the use of multiple conditions in the WHERE clause to specify which rows should be removed. This allows for flexibility in managing data deletion based on various criteria.
Option B: True. The INSERT statement can explicitly insert NULL values into a column, assuming there are no constraints (like NOT NULL) preventing such entries. This is useful for representing the absence of data or when data is unknown.
Option C: False. DML statements like INSERT INTO...SELECT...FROM do not automatically commit in Oracle. Transactions in Oracle require explicit COMMIT commands to finalize changes, unless in an autocommit mode set by a client tool or environment, which is generally not the default behavior for server-side operations.
Option D: False. DML statements do not require a primary key to be defined on a table. While having a primary key is a best practice for identifying each row uniquely, it's not a prerequisite for performing DML operations like INSERT, UPDATE, or DELETE.
Option E: True. The UPDATE statement can include different subqueries within the SET clause to determine the values for each column being updated. This allows for complex calculations and data retrieval to be part of an update, increasing the power and flexibility of data modification.

NEW QUESTION # 199
Examine the structure of the DEPARTMENTS table.

You execute the following command:

Which two statements are true? (Choose two.)

A. Synonyms existing of the DEPARTMENTStable would have to be re-created.
B. Views created in the DEPARTMENTStable that include the COUNTRYcolumn are automatically modified and remain valid.
C. Unique key constraints defined on the COUNTRYcolumn are removed.
D. A new column, COUNTRY, can be added to the DEPARTMENTStable after executing the command.
E. Indexes created on the COUNTRYcolumn exist until the DROP UNUSED COLUMNScommand is executed.

Answer: C,D

NEW QUESTION # 200
Evaluate the following SQL commands:

The command to create a table fails. Identify the reason for the SQL statement failure.

A. You cannot use the NEXTVALsequence value as a DEFAULTvalue for a column.
B. You cannot use SYSDATEin the condition of a CHECKconstraint.
C. You cannot use ORD_NOand ITEM_NOcolumns as a composite primary key because ORD_NOis also the FOREIGN KEY.
D. You cannot use the BETWEENclause in the condition of a CHECKconstraint.

Answer: B

NEW QUESTION # 201
......

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1Z1-071–100% FREE LATEST LEARNING MATERIALS | VALID ORACLE DATABASE SQL VALID EXAM VCE

1z1-071–100% Free Latest Learning Materials | Valid Oracle Database SQL Valid Exam Vce