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Oracle 1z0-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
Topic 2: Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints
Topic 3: Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
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: 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

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Oracle Database SQL Sample Questions (Q83-Q88):

NEW QUESTION # 83
Examine these SQL statements which execute successfully:

Which two statements are true after execution?

A. The foreign key constraint will be enabled and IMMEDIATE.
B. The foreign key constraint will be disabled.
C. The foreign key constraint will be enabled and DEFERRED.
D. The primary key constraint will be enabled and DEFERRED.
E. The primary key constraint will be enabled and IMMEDIATE.

Answer: A,E

Explanation:
After the execution of the given SQL statements:
B . The primary key constraint will be enabled and IMMEDIATE. This is true. The last statement ENABLE CONSTRAINT emp_emp_no_pk; enables the primary key constraint immediately.
E . The foreign key constraint will be enabled and IMMEDIATE. This is correct as well. The foreign key constraint emp_mgr_fk was not explicitly disabled, so it remains enabled and in the immediate checking mode.
Options A, C, and D are incorrect:
A is incorrect because constraints are immediate by default; they are not deferred unless explicitly stated.
C is incorrect because the foreign key constraint emp_mgr_fk was never disabled with the given statements.
D is incorrect because there is no statement altering the foreign key constraint to a deferred state.

NEW QUESTION # 84
Which statement is true regarding the USINGclause in table joins? (Choose two.)

A. It can be used to join a maximum of three tables.
B. It can be used to access data from tables through equijoins as well as nonequijoins.
C. It can be used to join tables that have columns with the same name and compatible data types.
D. It can be used to restrict the number of columns used in a NATURALjoin.

Answer: C,D

Explanation:
Explanation/Reference:

NEW QUESTION # 85
Examine the description of the transactions table:

Which two SQL statements execute successfully?

A. SELECT customer_id CUSTID, transaction_date TRANS_DATE,amount+100 DUES FROM transactions;
B. SELECT customer_id AS 'CUSTOMER-ID',transaction_date AS DATE, amount+100 'DUES' from transactions;
C. SELECT customer_id AS "CUSTOMER-ID", transaction_date AS DATE, amount+100 "DUES" from transactions;
D. SELECT customer_id AS "CUSTOMER-ID", transaction_date AS "DATE", amount+100 DUES FROM transactions;
E. SELECT customer id AS CUSTOMER-ID, transaction_date AS TRANS_DATE, amount+100 "DUES AMOUNT" FROM transactions;

Answer: A,C

Explanation:
A . True, this statement will execute successfully. In Oracle SQL, column aliases can be given in double quotes which allows the use of special characters like a hyphen. Additionally, you can perform arithmetic operations such as amount+100 directly in the SELECT clause to return increased values of amount.
C . True, this statement is also valid. It does not use any special characters or reserved keywords as aliases that would require double quotes. The arithmetic operation is the same as in option A, which is permissible.
For B, D, and E, the reasons for failure are: B. In Oracle SQL, single quotes are used for string literals, not for column aliases. Therefore, using single quotes around 'CUSTOMER-ID' and 'DUES' will result in an error. D. The word "DATE" is a reserved keyword in Oracle SQL. When used as a column alias without double quotes, it will lead to an error. In this statement, although "DATE" is in double quotes, it's a best practice to avoid using reserved keywords as aliases. E. There are syntax errors in the statement. "customer id" should be "customer_id", and the alias "CUSTOMER-ID" should be enclosed in double quotes if special characters are used. Also, "DUES AMOUNT" as an alias should be in double quotes to be valid because it contains a space.
Reference:
Oracle documentation on column aliases: Oracle Database SQL Language Reference Oracle reserved words: Oracle Database SQL Language Reserved Words

NEW QUESTION # 86
Examine the structure of the SALES table. (Choose two.)

Examine this statement:

Which two statements are true about the SALES1 table? (Choose two.)

A. It will have NOT NULL constraints on the selected columns which had those constraints in the SALES table.
B. It has PRIMARY KEY and UNIQUE constraints on the selected columns which had those constraints in the SALES table.
C. It is created with no rows.
D. It will not be created because of the invalid WHERE clause.
E. It will not be created because the column-specified names in the SELECT and CREATE TABLE clauses do not match.

Answer: A,C

NEW QUESTION # 87
You need to calculate the number of days from 1st January 2019 until today.
Dates are stored in the default format of DD-MON-RR.
Which two queries give the required output?

A. SELECT ROUND(SYSDATE ?'01-JAN-2019') FROM DUAL;
B. SELECT TO_DATE(SYSDATE, `DD/MONTH/YYYY') ?`01/JANUARY/2019' FROM DUAL;
C. SELECT SYSDATE ?TO_DATE('01-JANUARY-2019') FROM DUAL;
D. SELECT ROUND(SYSDATE ?TO_DATE(`01/JANUARY/2019')) FROM DUAL;
E. SELECT TO_CHAR(SYSDATE, `DD-MON-YYYY') ?'01-JAN-2019' FROM DUAL;

Answer: E

NEW QUESTION # 88
......

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