1Z0-071 VALID BRAINDUMPS PDF - TEST 1Z0-071 GUIDE ONLINE

1z0-071 Valid Braindumps Pdf - Test 1z0-071 Guide Online

1z0-071 Valid Braindumps Pdf - Test 1z0-071 Guide Online

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Oracle Database SQL Sample Questions (Q125-Q130):

NEW QUESTION # 125
You execute this command:
ALTER TABLE employees SET UNUSED (department_id);
Which two are true?

  • A. A new column with the name DEPARTMENT_ID can be added to the EMPLOYEES table.
  • B. A query can display data from the DEPARTMENT_ID column.
  • C. The storage space occupied by the DEPARTMENT_ID column is released only after a COMMIT is issued.
  • D. The DEPARTMENT_ID column is set to null for all tows in the table
  • E. No updates can be made to the data in the DEPARTMENT_ID column.
  • F. The DEPARTMENT_ID column can be recovered from the recycle bin

Answer: A,E

Explanation:
D . True, after setting the DEPARTMENT_ID column to UNUSED, you can add a new column with the name DEPARTMENT_ID to the EMPLOYEES table. The UNUSED clause does not delete the column, it only marks it as no longer being used.
E . True, once a column is marked as UNUSED, you cannot make updates to it. It becomes inaccessible for DML operations.
A, B, C, and F are not correct because: A. Once a column is set to UNUSED, it is not available for queries. B. The storage space is not immediately released after issuing a COMMIT; instead, the actual removal and space reclamation happen when you subsequently issue the DROP UNUSED COLUMNS operation. C. The DEPARTMENT_ID column is not set to null; instead, it's marked as UNUSED, which means it is no longer available for use. F. UNUSED columns are not placed into the recycle bin; they are just marked for deletion, and space can be reclaimed with the DROP UNUSED COLUMNS command.
Reference:
Oracle documentation on ALTER TABLE: Oracle Database SQL Language Reference Understanding ALTER TABLE SET UNUSED: Oracle Database Administrator's Guide


NEW QUESTION # 126
Evaluate the following SQL statement
SQL>SELECT promo_id, prom _category FROM promotions
WHERE promo_category='Internet' ORDER BY promo_id
UNION
SELECT promo_id, promo_category FROM Pomotions
WHERE promo_category = 'TV'
UNION
SELECT promoid, promocategory FROM promotions WHERE promo category='Radio' Which statement is true regarding the outcome of the above query?

  • A. It produces an error because positional, notation cannot be used in the ORDER BY clause with SBT operators.
  • B. It executes successfully and displays rows in the descend ignore of PROMO CATEGORY.
  • C. It executes successfully but ignores the ORDER BY clause because it is not located at the end of the compound statement.
  • D. It produces an error because the ORDER BY clause should appear only at the end of a compound query-that is, with the last SELECT statement.

Answer: C

Explanation:
* C. It executes successfully but ignores the ORDER BY clause because it is not located at the end of the compound statement: The ORDER BY clause in a compound query using UNION should be placed at the very end of the final SELECT statement. Since it's located with the first SELECT, it will be ignored.


NEW QUESTION # 127
You execute this query:

What is the result?

  • A. It returns the date for the first Monday of the next month.
  • B. It generates an error.
  • C. It executes successfully but does not return any result.
  • D. It returns the date for the last Monday of the current month.

Answer: A


NEW QUESTION # 128
View the Exhibit and examine the structure of the PRODUCT_INFORMATION table.

PRODUCT_ID column is the primary key.
You create an index using this command:
SQL > CREATE INDEX upper_name_idx
ON product_information(UPPER(product_name));
No other indexes exist on the PRODUCT_INFORMATION table.
Which query would use the UPPER_NAME_IDX index? (Choose the best answer.)

  • A. SELECT UPPER(product_name)FROM product_information;
  • B. SELECT UPPER(product_name)FROM product_informationWHERE product_id = 2254;
  • C. SELECT product_id, UPPER(product_name)FROM product_informationWHERE UPPER(product_name)='LASERPRO' OR list_price > 1000;
  • D. SELECT product_idFROM product_informationWHERE UPPER(product_name) IN ('LASERPRO', 'CABLE');

Answer: D


NEW QUESTION # 129
Which two statements are true about the COUNT function?

  • A. It can only be used for NUMBER data types.
  • B. COUNT(*) returns the number of rows in a table including duplicate rows and rows containing NULLs in any column.
  • C. COUNT (DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULLs in the INV_AMT column
  • D. COUNT(inv_amt) returns the number of rows in a table including rows with NULL in the INV_AMT column.
  • E. A SELECT statement using the COUNT function with a DISTINCT keyword cannot have a WHERE clause.

Answer: B,C


NEW QUESTION # 130
......

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