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Oracle Database SQL Sample Questions (Q297-Q302):

NEW QUESTION # 297
Examine the structure of the PROMOTIONS table: (Choose the best answer.) Management requires a report of unique promotion costs in each promotion category.
Which query would satisfy this requirement?

A. SELECT DISTINCT promo_cost, promo_category FROM promotions
B. SELECT DISTINCT promo_cost, DISTINCT promo_category FROM promotions;
C. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1
D. SELECT promo_category, DISTINCT promo_cost FROM promotions

Answer: C

NEW QUESTION # 298
Which two statements are true about * _TABLES views?

A. ALL TABLES displays all tables owned by the current user.
B. USER TABLES displays all tables owned by the current user.
C. All users can query DBA_TABLES successfully.
D. You must have ANY TABLE system privileges, or be granted object privilges on the table, to viewa tabl e in DBA TABLES.
E. You must have ANY TABLE system privileges, or be granted object privileges on the table, to view a table in USER_TABLES.
F. You must have ANY TABLE system privileges, or be granted object privileges on the table, to view a table in ALL_TABLES.

Answer: A,B

Explanation:
In Oracle, *_TABLES views provide information about tables.
B . USER_TABLES displays all tables owned by the current user, making this statement true. No additional privileges are required to see your own tables.
D . ALL_TABLES displays all tables that the current user has access to, either through direct ownership or through privileges, making this statement true.
A, C, E, and F are incorrect. Specifically:
A and E are incorrect because you do not need ANY TABLE system privileges to view tables in DBA_TABLES or ALL_TABLES; you need the SELECT_CATALOG_ROLE or equivalent privileges.
C is incorrect because as a user, you do not need additional privileges to see your own tables in USER_TABLES.
F is incorrect because not all users can query DBA_TABLES; this requires specific privileges or roles.
Reference:
Oracle Database Reference, 12c Release 1 (12.1): "Static Data Dictionary Views"

NEW QUESTION # 299
Examine the description of the SALES table:

The SALES table has 5,000 rows.
Examine this statement:
CREATE TABLE sales1 (prod id, cust_id, quantity_sold, price)
AS
SELECT product_id, customer_id, quantity_sold, price
FROM sales
WHERE 1=1
Which two statements are true?

A. SALES1 is created with 1 row.
B. SALES1 has PRIMARY KEY and UNIQUE constraints on any selected columns which had those constraints in the SALES table.
C. SALES1 has NOT NULL constraints on any selected columns which had those constraints in the SALES table.
D. SALES1 Is created with 5,000 rows.

Answer: A,C

Explanation:
When creating a new table with a query, the statements that are true are:
A . SALES1 is created with 1 row.
This is incorrect actually; the given query with WHERE 1=1 will retrieve all rows from the sales table, not just one row. Therefore, SALES1 will be created with the same number of rows as in the SALES table, assuming there are no WHERE clause conditions limiting the rows.
D . SALES1 has NOT NULL constraints on any selected columns which had those constraints in the SALES table.
This is true. When a table is created using a CREATE TABLE AS SELECT statement, the NOT NULL constraints on the columns in the selected columns are preserved in the new table.
Options B and C are incorrect:
B is incorrect because the primary key and unique constraints are not carried over to the new table when using the CREATE TABLE AS SELECT syntax.
C is incorrect in the context of this scenario. However, if interpreted as a standalone statement (ignoring A), C would be the correct description of the outcome since WHERE 1=1 will not filter out any rows.

NEW QUESTION # 300
Which two are true about external tables that use the ORACLE _DATAPUMP access driver?

A. Creating an external table creates a directory object.
B. Creating an external table creates a dump file that can be used by an external table in the same or a different database.
C. Creating an external table creates a dump file that can be used only by an external table in the same database.
D. When creating an external table, data can be selected only from a table whose rows are stored in database blocks.
E. When creating an external table, data can be selected from another external table or from a table whose rows are stored in database blocks.

Answer: E

Explanation:
External tables using the ORACLE_DATAPUMP access driver have specific characteristics:
C . Creating an external table using the ORACLE_DATAPUMP access driver allows you to select data from other tables, including another external table or a regular table whose rows are stored in database blocks.
A, B, D, and E are incorrect. Specifically:
A is incorrect because creating an external table does not automatically create a directory object; the directory object must exist prior to or be created separately.
B is incorrect as it limits the creation to tables stored in database blocks, which is not a restriction.
D is incorrect because creating an external table does not create a dump file; it reads from an existing dump file created by Data Pump.
E is also incorrect because the dump file is not created as part of the external table creation process.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "CREATE TABLE" for External Tables

NEW QUESTION # 301
The STORES table has a column START_DATE of data type DATE, containing the datethe row was inserted.
You only want to display details of rows where START_DATEis within the last 25 months.which WHERE clause can be used?

A. WHERE MONTHS_BETWEEN (start_date, SYSDATE)<=25
B. WHERE MONTHS_BETWEEN(SYSDATE, start_date)<=25
C. WHERE ADD_MONTHS (start date , 25)<= SYSDATE
D. WHERE TO_NUMBER(start_date - SYSDATE)<=25

Answer: B

NEW QUESTION # 302
......

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