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Oracle 1z0-071 exam, also known as the Oracle Database SQL exam, is a certification exam designed to evaluate the skills and knowledge of individuals in SQL database management. 1z1-071 exam is intended for database administrators, developers, and IT professionals who use SQL as a part of their daily work. 1z1-071 exam is divided into multiple sections that cover different aspects of SQL, such as data retrieval, manipulation, and management. 1z1-071 Exam validates the ability to use SQL to manage data in an Oracle database environment, as well as the ability to create and maintain database objects such as tables, views, and indexes.
NEW QUESTION # 45
Examine these statements and results:
SQL> SELECT COUNT(*) FROM emp
COUNT(*)
---------------------
14
sQL> CREATE GLOBAL TEMPORARY TABLE t emp As SELECT * FROM emp;
Table created
SQL> INSERT INTo temp SELECT * FROM emp;
14 rows created
SQL> COMMIT:
Commit complete*
SQL> INSERT INTo temp SELECT * EROM emp;
14. rows created
SQL> SELECT COUNT(*) FROM t emp
How many rows are retrieved by the last query?
Answer: A
Explanation:
Global temporary tables in Oracle Database are designed to hold temporary data for the duration of a session or a transaction.
Given that the global temporary table is created and then populated twice from the emp table without any mention of data deletion, one would initially think the count would be 28, since 14 rows are inserted twice. However, if the temporary table was created with the default ON COMMIT DELETE ROWS option, the rows are deleted at the end of the transaction, which is signified by the COMMIT operation.
Thus, after the first COMMIT, the temporary table would be empty. After the second INSERT, another 14 rows would be added. So, the last query would retrieve 14 rows unless a DELETE operation was committed.
Reference:
Oracle Documentation on Temporary Tables: https://docs.oracle.com/cd/B28359_01/server.111/b28310/tables003.htm#ADMIN11633 Please note that the actual number of rows retrieved by the last query could differ if there are any triggers, cascading deletes, or the table is defined differently than assumed in this context.
NEW QUESTION # 46
Which three statements are true about multiple row subqueries?
Answer: B,C,E
Explanation:
Multiple row subqueries are subqueries that are used where a subquery is allowed, but they can return more than one row. This means they can be used with operators that allow multiple values like IN, ANY, ALL, etc.
* Option A: They can contain HAVING clauses. This is true. A multiple row subquery can use aggregate functions and, therefore, can include a HAVING clause to filter the results of these aggregates. A HAVING clause is used in a similar way to a WHERE clause, except that it is used to filter rows after an aggregation is performed.
* Option D: They can return multiple columns. This is true. A multiple row subquery can indeed return more than one column, which can be used in the outer query, depending on the context, such as in the column comparison subqueries.
* Option E: They can contain GROUP BY clauses. This is true. Since multiple row subqueries can include aggregate functions, they can also include a GROUP BY clause to specify the grouping of data on which to apply the aggregate functions.
Regarding the incorrect options:
* Option B: Two or more values are always returned from the subquery. This is false. Multiple row subqueries have the potential to return multiple rows, but they are not required to do so. They could return zero, one, or multiple rows depending on the data and the specific query.
* Option C: They cannot contain subquery. This is false. Multiple row subqueries can contain other subqueries within them, which are known as nested subqueries.
For further reading and verification of these points, one can refer to the Oracle Database SQL Language Reference 12c, specifically the sections on subquery syntax and semantics, which discuss the use of HAVING
, GROUP BY, and the ability of subqueries to return multiple rows or columns.
NEW QUESTION # 47
View the Exhibit and examine the structure of the ORDER_ITEMS table.
Examine the following SQL statement:
SELECT order_id, product_id, unit_price
FROM order_items
WHERE unit_price =
(SELECT MAX(unit_price)
FROM order_items
GROUP BY order_id);
You want to display the PRODUCT_ID of the product that has the highest UNIT_PRICE per ORDER_ID.
What correction should be made in the above SQL statement to achieve this?
Answer: D
NEW QUESTION # 48
View the exhibit and examine the description of the PRODUCT_INFORMATIONtable.
Which SQL statement would retrieve from the table the number of products having LIST_PRICEas NULL?
SELECT COUNT (DISTINCT list_price)
Answer: C
NEW QUESTION # 49
Which two statements will return the names of the three employees with the lowest salaries?
Answer: D
Explanation:
To retrieve the names of the three employees with the lowest salaries, the correct SQL syntax and logic are crucial:
Option B:
SELECT last_name, salary FROM employees ORDER BY salary FETCH FIRST 3 ROWS ONLY; This query correctly sorts employees by their salary in ascending order and fetches the first three rows only. The FETCH FIRST n ROWS ONLY syntax is a standard way to limit the result set in SQL.
Options A, C, D, and E do not correctly implement the logic for fetching the lowest three salaries due to misuse of ROWNUM or incorrect placement of ORDER BY and FETCH clauses.
NEW QUESTION # 50
......
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