1z0-071日本語参考 & 1z0-071日本語認定

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Oracle Database SQL 認定 1z0-071 試験問題 (Q388-Q393):

質問 # 388
Examine this query:
SELECT TRUNC (ROUND(156.00,-2),-1) FROM DUAL; What is the result?

A. 0
B. 1
C. 2
D. 3
E. 4

正解：B

解説：
The query uses two functions: ROUND and TRUNC. The ROUND function will round the number 156.00 to the nearest hundred because of the -2 which specifies the number of decimal places to round to. This will result in 200. Then the TRUNC function truncates this number to the nearest 10, due to the -1 argument, which will give us 200 as the result since truncation does not change the rounded value in this case.
* A. 16 (Incorrect)
* B. 160 (Incorrect)
* C. 150 (Incorrect)
* D. 200 (Incorrect)
* E. 100 (Incorrect)

質問 # 389
Which two are true about unused columns?

A. Unused columns retain their data until they are dropped
B. A primary key column cannot be set to unused.
C. A foreign key column cannot be set to unused.
D. A query can return data from unused columns, but no DML is possible on those columns.
E. The DESCRIBE command displays unused columns
F. Once a column has been set to unused, a new column with the same name can be added to the table.

正解：A、F

解説：
Unused columns are a feature in Oracle that allows a column to be marked as unused without immediately dropping it from the table structure. The key points for each option are:
A: The DESCRIBE command does not display unused columns. These columns are also not visible in user_tab_cols but are visible in user_unused_col_tabs.
B: Primary key columns can be set to unused, but you must drop the primary key constraint before doing so.
C: Once a column is marked as unused, it is not possible to query it, and Oracle will not allow DML operations on that column.
D: This is true. Once a column is set to unused, you can add a new column with the same name because Oracle essentially considers the unused column as removed from the table.
E: Just like primary key columns, a foreign key column can be marked as unused, but you must drop the foreign key constraint first.
F: This is true. Unused columns retain their data until the column is dropped using the DROP UNUSED COLUMNS command.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "ALTER TABLE"
* Oracle Database Administrator's Guide, 12c Release 1 (12.1)

質問 # 390
Which three statements are true about multiple row subqueries? (Choose three.)

A. They can return multiple columns.
B. Two or more values are always returned from the subquery.
C. They cannot contain a subquery.
D. They can contain HAVINGclauses.
E. They can contain GROUP BY clauses.

正解：A、D、E

質問 # 391
Which two actions can you perform with object privileges?

A. Execute a procedure or function in another schema.
B. Delete rows from tables in any schema except sys.
C. Create roles.
D. Set default and temporary tablespaces for a user.
E. Create FOREIGN KEY constraints that reference tables in other schemas.

正解：A、B

解説：
Regarding object privileges in an Oracle database:
* B. Delete rows from tables in any schema except sys: Object privileges include DELETE on tables, which can be granted by the owner of the table or a user with adequate privileges, excluding system schemas like SYS due to their critical role.
* E. Execute a procedure or function in another schema: EXECUTE is a specific object privilege that can be granted on procedures and functions, allowing users to run these objects in schemas other than their own.
Incorrect options:
* A: Creation of roles is related to system privileges, not object privileges.
* C: Setting default and temporary tablespaces for a user involves system-level operations, not object-level privileges.
* D: Creation of foreign key constraints involves referencing rights, which, while related, are not directly granted through object privileges but need appropriate REFERENCES permission.

質問 # 392
You execute this command:
TRUNCATE TABIE depts;
Which two are true?

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

正解：C、E

解説：
When the TRUNCATE TABLE command is used:
* C. It retains the indexes defined on the table. This is true. The TRUNCATE TABLE operation does not drop the indexes on the table; it only removes all rows from the table.
* D. It retains the integrity constraints defined on the table. This is correct. The TRUNCATE TABLE operation does not affect the integrity constraints; it retains them.
Options A, B, E, and F are incorrect:
* A is incorrect because the TRUNCATE TABLE operation cannot be rolled back as it is a DDL operation and not a DML operation like DELETE.
* B is incorrect because TRUNCATE TABLE does not drop any triggers; they remain in place.
* E is incorrect as TRUNCATE TABLE may or may not release the space depending on whether the REUSE STORAGE clause is used.
* F is incorrect because FLASHBACK TABLE cannot be used to retrieve data after a TRUNCATE TABLE operation since it does not generate redo logs that FLASHBACK relies upon.

質問 # 393
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