1Z1-071 VALID EXAM EXPERIENCE | LAB 1Z1-071 QUESTIONS

1z1-071 Valid Exam Experience | Lab 1z1-071 Questions

1z1-071 Valid Exam Experience | Lab 1z1-071 Questions

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Oracle Database SQL Sample Questions (Q292-Q297):

NEW QUESTION # 292
You and your colleague Andrew have these privileges on the EMPLOYEE_RECORDS table:
1. SELECT
2. INSERT
3. UPDATE
4. DELETE
You connect to the database instance an perform an update to some of the rows in EMPLOYEE_RECORDS, but don't commit yet.
Andrew connects to the database instance and queries the table
No othet user are accessing the table
Which two statements ate true at this point?

  • A. Andrew will be unable to perform any INSERT, UPDATE of DELETE on the teble
  • B. Andrew will be unable to see the changes you have made
  • C. Andrew will be able to SELECT from the table, but be unable to modify any existing rows.
  • D. Andrew will be able to modify any rows in the table that have not been modified by your transaction
  • E. Andrew will be able to see the changes you habe made

Answer: B,D

Explanation:
In Oracle Database, when a transaction is not committed, the changes it makes are not visible to other sessions.
This is due to Oracle's read consistency model, which means that Andrew will not be able to see the changes you have made until they are committed.
Option A is correct because, in Oracle, another session can modify rows that have not been locked by an uncommitted transaction.
Option C is incorrect because, as per Oracle's read consistency, the changes made by an uncommitted transaction are not visible to other users.
Option D is incorrect because Andrew can perform INSERT, UPDATE, or DELETE operations on the rows that you have not modified.
Option E is incorrect because, while Andrew will be able to SELECT from the table, he will still be able to modify rows that are not locked by your uncommitted update.
References:
* Oracle Documentation on Transactions: Transactions
* Oracle Documentation on Read Consistency: Read Consistency


NEW QUESTION # 293
Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE and QUANTITY, of data type NUMBER Statement 1:
SELECT MAX (unit price*quantity) "Maximum Order FROM order items;
Statement 2:
SELECT MAX (unit price*quantity "Maximum order" FROM order items GROUP BY order id; Which two statements are true?

  • A. Both statements will return NULL if either UNIT PRICE or QUANTITY contains NULL,
  • B. Statement 2 may return multiple rows of output.
  • C. Statement 1 returns only one row of output.
  • D. Statement 2 returns only one row of output.
  • E. Both the statement given the same output.

Answer: B,C

Explanation:
Analyzing the given SQL statements on the ORDER_ITEMS table:
* D. Statement 2 may return multiple rows of output: Statement 2 groups the results by ORDER_ID, which means it calculates the maximum UNIT_PRICE * QUANTITY for each ORDER_ID, potentially returning multiple rows depending on the number of unique ORDER_IDs in the table.
* E. Statement 1 returns only one row of output: Statement 1 computes the maximum product of UNIT_PRICE and QUANTITY across all entries in the ORDER_ITEMS table, returning a single row with the maximum value.
Incorrect options:
* A: Since Statement 2 groups by ORDER_ID, it does not necessarily return just one row; it returns one row per ORDER_ID.
* B: These statements do not yield the same output; Statement 1 returns a single maximum value, while Statement 2 returns the maximum value per ORDER_ID.
* C: If either UNIT_PRICE or QUANTITY is NULL, the product for that row will be NULL, but the MAX function ignores NULL values in its calculation unless all rows are NULL, in which case it returns NULL.


NEW QUESTION # 294
Which three statements are true about views in an Oracle Database?

  • A. Views can join tables only if they belong to the same schema.
  • B. Rows inserted into a table using a view are retained in the table if the view is dropped.
  • C. A view can be created that refers to a non-existent table in its defining query.
  • D. A SELECT statement cannot contain a WHERE clause when querying a view containing a WHEREclause in its defining query.
  • E. Views have no segment.
  • F. Views have no object number.

Answer: A,C,F

Explanation:
Explanation
Explanation/Reference: https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_8004.htm#SQLRF01504
https://community.oracle.com/thread/2178948


NEW QUESTION # 295
Which three are true about scalar subquery expressions?

  • A. They cannot be used in group by clauses.
  • B. They cannot be used in the values clause of an insert statement*
  • C. A scalar subquery expression that returns zero rows evaluates to zoro
  • D. A scalar subquery expression that returns zero rows evaluates to null.
  • E. They can be used as default values for columns in a create table statement.
  • F. They can be nested.

Answer: D,E,F

Explanation:
Scalar subquery expressions are used in Oracle SQL to return a single value from a subquery.
* Option C: They can be nested.
* Scalar subqueries can indeed be nested within another scalar subquery, provided each subquery returns a single value.
* Option D: A scalar subquery expression that returns zero rows evaluates to null.
* According to Oracle documentation, if a scalar subquery returns no rows, the result is a NULL value, not zero or any other default.
* Option F: They can be used as default values for columns in a create table statement.
* Scalar subqueries can be specified in the DEFAULT clause of a column in a CREATE TABLE statement to dynamically assign default values based on the result of the subquery.
Options A, B, and E are incorrect based on Oracle SQL standards and functionalities.


NEW QUESTION # 296
View the exhibit for the structure of the STUDENT and FACULTY tables.

You need to display the faculty name followed by the number of students handled by the faculty at the base location.
Examine the following two SQL statements:
Statement 1
SQL>SELECT faculty_name, COUNT(student_id)
FROM student JOIN faculty
USING (faculty_id, location_id)
GROUP BY faculty_name;
Statement 2
SQL>SELECT faculty_name, COUNT(student_id)
FROM student NATURAL JOIN faculty
GROUP BY faculty_name;
Which statement is true regarding the outcome?

  • A. Both statements 1 and 2 execute successfully and give different results.
  • B. Only statement 2 executes successfully and gives the required result.
  • C. Both statements 1 and 2 execute successfully and give the same required result.
  • D. Only statement 1 executes successfully and gives the required result.

Answer: D


NEW QUESTION # 297
......

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