FANTASTIC ORACLE 1Z0-071 PRACTICE QUESTIONS - TRAININGDUMPS FREE DOWNLOAD

Fantastic Oracle 1z0-071 Practice Questions - TrainingDumps Free Download

Fantastic Oracle 1z0-071 Practice Questions - TrainingDumps Free Download

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Oracle Database SQL Sample Questions (Q161-Q166):

NEW QUESTION # 161
Examine the structure of the CUSTOMERS table: (Choose two.)

CUSTNO is the PRIMARY KEY.
You must determine if any customers' details have been entered more than once using a different CUSTNO, by listing all duplicate names.
Which two methods can you use to get the required result?

  • A. Self-join
  • B. Left outer-join with self-join
  • C. Full outer-join with self-join
  • D. Right outer-join with self-join
  • E. Subquery

Answer: A,E


NEW QUESTION # 162
View the Exhibit and examine the structure of the ORDERS table. The ORDER_ID column is the PRIMARY KEY in the ORDERS table.

Evaluate the following CREATE TABLE command:
CREATE TABLE new_orders(ord_id, ord_date DEFAULT SYSDATE, cus_id)
AS
SELECT order_id.order_date,customer_id
FROM orders;
Which statement is true regarding the above command?

  • A. The NEW_ODRDERS table would get created and only the NOT NULL constraint defined on the specified columns would be passed to the new table.
  • B. The NEW_ODRDERS table would not get created because the DEFAULT value cannot be specified in the column definition.
  • C. The NEW_ODRDERS table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
  • D. The NEW_ODRDERS table would get created and all the constraints defined on the specified columns in the ORDERS table would be passed to the new table.

Answer: A


NEW QUESTION # 163
Examine this SQL statement:

Which two are true?

  • A. The subquery is executed before the DELETE statement is executed.
  • B. The subquery is executed for every row in the EMPLOYEES table.
  • C. All existing rows in the EMPLOYEES table are deleted.
  • D. The subquery is not a correlated subquery.
  • E. The DELETE statement executes successfully even if the subquery selects multiple rows.

Answer: A,B


NEW QUESTION # 164
Examine the data in the NEW_EMPLOYEES table:

Examine the data in the EMPLOYEES table:

You want to:
1. Update existing employee details in the EMPLOYEES table with data from the NEW EMPLOYEES table.
2. Add new employee detail from the NEW_ EMPLOYEES able to the EMPLOYEES table.
Which statement will do this:

  • A. MERGE INTO employees e
    USING new employees ne
    ON (e.employee_id = ne.employee_id)
    WHEN FOUND THEN
    UPDATE SET e.name =ne.name, e.job_id=ne.job_id, e.salary =ne.salary
    WHEN NOT FOUND THEN
    INSERT VALUES (ne.employee_id,ne.name,ne.job_id,ne.salary) ;
  • B. MERGE INTO employees e
    USING new_employees n
    ON (e.employee_id = ne.employee_id)
    WHEN MATCHED THEN
    UPDATE SET e.name = ne.name, e.job id = ne.job_id,e.salary =ne. salary
    WHEN NOT MATCHED THEN
    INSERT VALUES (ne. employee_id,ne.name,ne.job_id,ne.salary);
  • C. MERGE INTO employees e
    USING new employees ne
    WHERE e.employee_id = ne.employee_ id
    WHEN MATCHED THEN
    UPDATE SET e.name = ne.name, e.job_id = ne.job_id,e.salary =ne. salary
    WHEN NOT MATCHED THEN
    INSERT VALUES (ne. employee_id,ne.name, ne.job_id,ne.salary) ;
  • D. MERGE INTO employees e
    USING new_employees n
    WHERE e.employee_id = ne.employee_id
    WHEN FOUND THEN
    UPDATE SET e.name=ne.name,e.job_id =ne.job_id, e.salary=ne.salary
    WHEN NOT FOUND THEN
    INSERT VALUES (ne.employee_ id,ne.name,ne.job id,ne.salary) ;

Answer: B

Explanation:
The correct answer to perform the specified update and insert operations is to use the MERGE statement, which is designed to facilitate such "upsert" operations (update or insert).
A). The syntax is incorrect; the WHERE clause is not used with MERGE.
B). This is the correct syntax and use of the MERGE statement. It uses the ON clause to specify the join condition, and it provides actions for WHEN MATCHED and WHEN NOT MATCHED situations.
C). The keywords FOUND and NOT FOUND are not valid in the context of the MERGE statement in Oracle SQL.
D). Similar to option A, the syntax is incorrect because MERGE uses an ON clause, not a WHERE clause, and the keywords FOUND and NOT FOUND are incorrect.
The correct syntax of a MERGE statement includes defining a condition using the ON clause to determine how rows from the source and target tables are matched, then specifying the actions for when rows match (WHEN MATCHED) and when they do not match (WHEN NOT MATCHED).
References:
* Oracle Documentation on MERGE:
https://docs.oracle.com/database/121/SQLRF/statements_9016.htm#SQLRF01606


NEW QUESTION # 165
Which two statements are true regarding constraints? (Choose two.)

  • A. All constraints can be defined at the column level and at the table level.
  • B. A constraint can be disabled even if the constraint column contains data.
  • C. A foreign key column cannot contain NULLS.
  • D. A column with the UNIQUE constraint can contain NULLS.
  • E. A constraint is enforced only for INSERT operations.

Answer: B,D


NEW QUESTION # 166
......

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