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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Subqueries and Advanced SQL	- Correlated subqueries and nested queries - Single-row and multi-row subqueries
Topic 2: Relational Database Concepts	- Data types and database objects overview - Tables, rows, columns, and relational model basics
Topic 3: SQL Retrieval	- SELECT statements and filtering data 1. WHERE clause and conditions 2. ORDER BY and row limiting - Joins and set operations 1. INNER, OUTER, CROSS joins 2. UNION, INTERSECT, MINUS
Topic 4: SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions
Topic 5: Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints

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Oracle Database SQL Sample Questions (Q264-Q269):

NEW QUESTION # 264
Which three are true about the MERGE statement

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

Answer: A,B,E

Explanation:
B: True. The Oracle Database MERGE statement can use a subquery that involves views to generate the source data for the merge operation. This allows for greater flexibility in specifying the data to be merged.
C: True. MERGE can conditionally combine rows from one or more source tables (or views, or the results of a subquery) to insert or update rows in a single target table based on whether or not a match exists.
D: True. MERGE can indeed use subqueries to produce source rows. The source data for a merge operation can be a table, view, or the result of a subquery.
The MERGE statement is a powerful SQL operation in Oracle that allows for conditional INSERT or UPDATE operations in one statement, often referred to as an "upsert" operation. It can handle complex scenarios where the decision to insert or update is based on whether the data matches between the target and source datasets.
References:Oracle SQL documentation on the MERGE statement provides information on how it can use different data sources, including subqueries and views, and perform conditional operations on the target table.

NEW QUESTION # 265
Examine the description of the BOOKS table:

The table has 100 rows.
Examine this sequence of statements issued in a new session;
INSERT INTO BOOKS VALUES ('ADV112' , 'Adventures of Tom Sawyer', NULL, NULL); SAVEPOINT a; DELETE from books; ROLLBACK TO SAVEPOINT a; ROLLBACK; Which two statements are true?

A. The second ROLLBACK command replays the delete.
B. The first ROLLBACK command restores the 101 rows that were deleted, leaving the inserted row still to be committed.
C. The first ROLLBACK command restores the 101 rows that were deleted and commits the inserted row.
D. The second ROLLBACK command undoes the insert.
E. The second ROLLBACK command does nothing.

Answer: B,D

NEW QUESTION # 266
View the Exhibit and examine the description for the PRODUCTS and SALES table.

PROD_ID is a primary key in the PRODUCTS table and foreign key in the SALES table with ON DELETE CASCADE option. The SALES table contains data for the last three years. You want to remove all the rows from the PRODUCTS table for which no sale was done for the last three years.
Which is the valid DELETE statement?

A. DELETEFROM productsWHERE prod_id IN (SELECT prod_idFROM salesWHERE time_id >= SYSDATE - 3*365 );
B. DELETEFROM productsWHERE prod_id = (SELECT prod_idFROM salesWHERE SYSDATE >= time_id - 3*365 );
C. DELETEFROM productsWHERE prod_id = (SELECT prod_idFROM salesWHERE time_id - 3*365 = SYSDATE );
D. DELETEFROM productsWHERE prod_id IN (SELECT prod_idFROM salesWHERE SYSDATE -
3*365 >= time_id);

Answer: D

NEW QUESTION # 267
Examine the structure of the EMPLOYEES table.

You must display the details of employees who have manager with MANAGER_ID 100, who were hired in the past 6 months and who have salaries greater than 10000.

A. SELECT last_name, hire_date, salary
FROM employees
WHERE salary > 10000
UNION ALL
SELECT last_name, hire_date, salary
FROM employees
WHERE manager_ID = (SELECT employee_id FROM employees WHERE employee_id = 100) INETRSECT SELECT last_name, hire_date, salary
FROM employees
WHERE hire_date > SYSDATE- 180;
B. (SELECT last_name, hire_date, salary
FROM employees
WHERE salary > 10000
UNION ALL
SELECT last_name, hire_date, salary
FROM employees
WHERE manager_ID = (SELECT employee_id FROM employees WHERE employee_id = 100)) UNION SELECT last_name, hire_date, salary
FROM employees
WHERE hire_date > SYSDATE -180;
C. SELECT last_name, hire_date, salary
FROM employees
WHERE manager_id = (SELECT employee_id FROM employees WHERE employee_id = '100') UNION SELECT last_name, hire_date, salary
FROM employees
WHERE hire_date > SYSDATE -180
INTERSECT
SELECT last_name, hire_date, salary
FROM employees
WHERE salary > 10000;
D. SELECT last_name, hire_date, salary
FROM employees
WHERE manager_id = (SELECT employee_id FROM employees WHERE employee_id = 100) UNION ALL (SELECT last_name, hire_date, salary
FROM employees
WHERE hire_date > SYSDATE -180
INTERSECT
SELECT last_name, hire_date, salary
FROM employees
WHERE salary > 10000);

Answer: C

NEW QUESTION # 268
Which two statements are true about TRUNCATE and DELETE? (Choose two.)

A. TRUNCATE leaves any indexes on the table in an UNUSABLE state.
B. The result of a DELETE can be undone by issuing a ROLLBACK.
C. TRUNCATE can use a WHERE clause to determine which row(s) should be removed.
D. The result of a TRUNCATE can be undone by issuing a ROLLBACK.
E. DELETE can use a WHERE clause to determine which row(s) should be removed.

Answer: B,E

NEW QUESTION # 269
......

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