ORACLE 1Z1-071 PDF QUESTIONS–BEST EXAM PREPARATION STRATEGY

Oracle 1z1-071 PDF Questions–Best Exam Preparation Strategy

Oracle 1z1-071 PDF Questions–Best Exam Preparation Strategy

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Oracle Database SQL Sample Questions (Q104-Q109):

NEW QUESTION # 104
The first DROP operation is performed on PRODUCTS table using this command:
DROP TABLE products PURGE;
Then a FLASHBACK operation is performed using this command:
FLASHBACK TABLE products TO BEFORE DROP;
Which is true about the result of the FLASHBACK command?

  • A. It recovers the table structure and data but not the related indexes.
  • B. It is not possible to recover the table structure, data, or the related indexes.
  • C. It recovers only the table structure.
  • D. It recovers the table structure, data, and the indexes.

Answer: B

Explanation:
Explanation
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_9003.htm


NEW QUESTION # 105
Which two statements are true about Entity Relationships?

  • A. A one-to-one relationship is always a self-referencing relationship
  • B. A many-to-many relationship can be implemented only by using foreign keys
  • C. A Relationship can be mandatory for both entities
  • D. A table name can be specified just once when selecting data from a table having a selfreferencing relationship
  • E. A one-to-many relatonship in one direction is a one-to-one relationship in the other direction

Answer: B,C


NEW QUESTION # 106
In the EMPLOYEES table there are 1000 rows and employees are working in the company for more than
10 years.
Evaluate the following SQL statement:

What would be the result?

  • A. It executes successfully but no rows updated.
  • B. It gives an error because multiple NVL functions are used in an expression.
  • C. It executes successfully and updates the records of those employees who have been working in the company for more than 600 days.
  • D. It gives an error because NVL function cannot be used with UPDATE.

Answer: C


NEW QUESTION # 107
View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS and TIMES tables.
The PROD_ID column is the foreign key in the SALES table referencing the PRODUCTS table.
The CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the CUSTOMERS and TIMES tables, respectively.
Examine this command:
CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true?

  • A. The NEW_SALES table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
  • B. The NEW_SALES table would get created and all the FOREIGN KEY constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.
  • C. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the column definition.
  • D. The NEW_SALES table would get created and all the NOT NULL constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.

Answer: D


NEW QUESTION # 108
which three statements are true regarding single row subqueries?

  • A. THEY MUST BE PLACED ON THE RIGHT SIDE OF THE COMPARISON OPERATOR OR
    CONDITION.
  • B. THEY CAN BE USED IN THE HAVING CLAUSE
  • C. they must return a row to prevent errors in the SQL statement.
  • D. THEY CAN BE USED in the where clause.
  • E. they must be placed on the left side of the comparison operator or condition.
  • F. A SQL STATEMENT MAY HAVE MULTIPLE SINGLE ROW SUBQUERY BLOCKS.

Answer: B,D,F

Explanation:
Regarding single-row subqueries:
* A. THEY CAN BE USED in the where clause: Single-row subqueries can be used in the WHERE clause to compare a column's value against the result of the subquery.
* B. A SQL STATEMENT MAY HAVE MULTIPLE SINGLE ROW SUBQUERY BLOCKS: It is possible to use more than one single-row subquery within a SQL statement, each potentially in different parts of the statement (e.g., SELECT clause, WHERE clause).
* E. THEY CAN BE USED IN THE HAVING CLAUSE: Similar to the WHERE clause, single-row subqueries can also be used in the HAVING clause to filter groups based on a condition evaluated against a subquery result.
Incorrect options are:
* C and D: There is no such limitation on the placement of single-row subqueries relative to the comparison operator; they can be used on either side.
* F: Single-row subqueries must return exactly one row to avoid errors, but they do not necessarily have to return a row; if no row is returned, the query may still execute, potentially returning no rows in the outer query.


NEW QUESTION # 109
......

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