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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints
SQL Functions	- Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions - Single-row functions 1. Character, numeric, date functions
Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
SQL Retrieval	- Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS - SELECT statements and filtering data 1. ORDER BY and row limiting 2. WHERE clause and conditions

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Oracle Database SQL 認定 1z1-071 試験問題 (Q284-Q289):

質問 # 284
Which three are true about the MERGEstatement? (Choose three.)

A. It can update, insert, or delete rows conditionally in multiple tables.
B. It can combine rows from multiple tables conditionally to insert into a single table.
C. It can update the same row of the target table multiple times.
D. It can use views to produce source rows.
E. It can use subqueries to produce source rows.
F. It can merge rows only from tables.

正解：A、D、E

解説：
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-merge/

質問 # 285
Examine the description of the EMPLOYEES table:

NLS_DATE_FORMAT is set to DD-MON-YY.
Which query requires explicit data type conversion?

A. SELECT join date 11.'11 salary FROM employees;
B. SELECT SUBSTR(join date, 1, 2)- 10 FROM employees;
C. SELECT join date + 20 FROM employees;
D. SELECT salary + 120.50 FROM employees;
E. SELECT join date FROM employees where join date > *10-02-2018*;

正解：E

質問 # 286
Which two statements are true about a full outer join?

A. The Oracle join operator (+) must be used on both sides of the join condition in the WHERE clause.
B. It returns only unmatched rows from both tables being joined.
C. It includes rows that are returned by an inner join.
D. It returns matched and unmatched rows from both tables being joined.
E. It includes rows that are returned by a Cartesian product.

正解：C、D

解説：
In Oracle Database 12c, regarding a full outer join:
* A. It includes rows that are returned by an inner join. This is true. A full outer join includes all rows from both joined tables, matching wherever possible. When there's a match in both tables (as with an inner join), these rows are included.
* D. It returns matched and unmatched rows from both tables being joined. This is correct and the essence of a full outer join. It combines the results of both left and right outer joins, showing all rows from both tables with matching rows from the opposite table where available.
Options B, C, and E are incorrect:
* B is incorrect because the Oracle join operator (+) is used for syntax in older versions and cannot implement a full outer join by using (+) on both sides. Proper syntax uses the FULL OUTER JOIN keyword.
* C is incorrect as a Cartesian product is the result of a cross join, not a full outer join.
* E is incorrect because it only describes the scenario of a full anti-join, not a full outer join.

質問 # 287
View the Exhibit and examine the structure of the ORDER_ITEMS and ORDERS tables.

You are asked to retrieve the ORDER_ID, product_ID, and total price (UNIT_PRICE multiplied by QUANTITY), where the total price is greater than 50,000.
You executed the following SQL statement:
SELECT prder_id, product_id, unit_price*quantity "Total Price"
FROM order_items
WHERE unit_price*quantity > 50000
NATURAL JOIN orders;
Which statement is true regarding the execution of the statement?

A. The statement would not execute because the ON keyword is missing in the NATURAL JOIN clause.
B. The statement would execute and provide the desired result.
C. The statement would not execute because the WHERE clause is before the NATURAL JOIN clause.
D. The statement would not execute because the USING keyword is missing in the NATURAL JOIN clause.

正解：C

質問 # 288
Examine the data in the ORD_ITEMS table:

Evaluate this query:

Which statement is true regarding the result?

A. It displays the item nos with their average quantity where the average quantity is more than double the overall minimum quantity of all the items in the table.
B. It displays the item nos with their average quantity where the average quantity is more than double the minimum quantity of that item in the table.
C. It returns an error because the HAVING clause should be specified after the GROUP BY clause.
D. It returns an error because all the aggregate functions used in the HAVING clause must be specified in the SELECT list.

正解：B

質問 # 289
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