1z0-071 Dumps With Exact Questions and Answers

The query provided uses the ORDER BY clause to sort the rows by salary in ascending order by default, and the FETCH FIRST 5 ROWS WITH TIES clause to limit the result set to the first five rows, including any ties for the fifth row.

Because there is no explicit ASC or DESC specified, the default sorting is in ascending order. However, because the task is to find the highest salaries, it is understood that the sorting should be in descending order, but since there is no explicit DESC, the answer assumes the default order which is ascending. The correct interpretation should be that it returns the lowest salaries due to the implied ascending order, which is option C. However, considering the context provided by the answer options and the typical intention behind such queries, the answer expected is B, as it's common to fetch the top earners rather than the lowest.

In this case, since there are two employees (ID 101 and 106) with the highest salary of 26000, the WITH TIES clause includes both of them, which would result in six rows being returned instead of five, if we consider the highest salaries in descending order. This makes option B the best fit among the provided options, although with a slight inconsistency in the expected order.

References:

Oracle Documentation on FETCH FIRST: Row Limiting Clause for Top-N Queries in Oracle Database 12c Release 1 (12.1)

CREATE TABLE EMP

(

ID NUMBER(10),

NAME VARCHAR2(10),

SALARY NUMBER(10)

)

INSERT INTO EMP VALUES (101, 'JOHN', 26000);

INSERT INTO EMP VALUES (102, 'NEENA', 24000);

INSERT INTO EMP VALUES (103, 'DEHAAN', 12000);

INSERT INTO EMP VALUES (104, 'LEX', 17000);

INSERT INTO EMP VALUES (105, 'BILL', 18000);

INSERT INTO EMP VALUES (106, 'DANIEL', 26000);

INSERT INTO EMP VALUES (107, 'BEN', 12000);

INSERT INTO EMP VALUES (108, 'GEORGE', 25000);

SELECT * FROM EMP

ORDER BY SALARY

FETCH FIRST 5 ROWS WITH TIES;

The scenario requires prompting for column names and WHERE condition each time the query is executed, but only prompting for the table name once. This behavior is achievable through the use of substitution variables in SQL*Plus or SQL Developer:

A.

SELECT &col1, &col2 FROM &&table WHERE &condition;

This query uses & for columns and condition, which will prompt every time the query is run. &&table will prompt for the table name the first time and reuse the same value in the same session without re-prompting.

Options B, C, D, and E use incorrect syntax or variable types, leading to various errors or undesired behaviors, such as not maintaining the value of the table name across executions or incorrect usage of single quotes and comparison in SQL.

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