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Oracle 1z0-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q18-Q23):

NEW QUESTION # 18
In the PROMOTIONS table, the PROMO_ BEGIN_DATE column is of data type and the default date format is DD-MON-RR Which two statements are true about expressions using PROMO_ BEGIN_DATE in a query?

A. PROMO_ BEGIN_DATE - SYSDATE will return an error
B. TODATE(PROMO BEGIN_DATE *5) will return a date
C. PROMO_ BEGIN_DATE - SYSDATE will return a number
D. TONUMBER (PROMO BEGIN_DATE) - 5 will return a number
E. PROMO_ BEGIN_DATE - 5 will return a date

Answer: C,E

Explanation:
In Oracle SQL, when you subtract a number from a date, the result is a date. When you subtract one date from another, the result is the number of days between the two dates.
* B: PROMO_BEGIN_DATE - 5 will subtract 5 days from the PROMO_BEGIN_DATE, resulting in a new date that is 5 days earlier than PROMO_BEGIN_DATE.
* C: PROMO_BEGIN_DATE - SYSDATE will return the number of days between the PROMO_BEGIN_DATE and the current date (SYSDATE).
The incorrect options are:
* A: TONUMBER(PROMO_BEGIN_DATE) - 5 will not return a number because
PROMO_BEGIN_DATE is a date, and TONUMBER is not a valid function to convert dates to numbers in Oracle.
* D: PROMO_BEGIN_DATE - SYSDATE will not return an error; it will return the number of days between the two dates as explained above.
* E: TODATE(PROMO_BEGIN_DATE * 5) will not return a date because PROMO_BEGIN_DATE
* 5 is not a valid operation in Oracle SQL as you cannot multiply a date by a number, and TODATE is not a valid function. The correct function name is TO_DATE.
References:
* Oracle Documentation on Date Arithmetic: Database SQL Language Reference - Datetime Functions

NEW QUESTION # 19
Table EMPLOYEEScontains columns including EMPLOYEE_ID, JOB_ID and SALARY.
Only the EMPLOYEE_ID column is indexed.
Rows exist for employees 100 and 200.
Examine this statement:

Which two statements are true? (Choose two.)

A. Employee 200 will have JOB_ID set to the same value as the JOB_ID of employee 100
B. Employees 100will have JOB_ID set to the same value as the JOB_ID of employee 200
C. Employees 100 and 200will have the same JOB_ID as before the update command
D. Employee 100will have SALARYset to the same value as the SALARYof employee 200
E. Employees 100and 200 will have the same SALARYas before the update command
F. Employee 200will have SALARYset to the same value as the SALARYof employee 100

Answer: B,C

NEW QUESTION # 20
Examine the description of the PROMOTIONStable:

You want to display the unique promotion costs in each promotion category.
Which two queries can be used? (Choose two.)

A. SELECT promo_cost, promo_category FROM promotions ORDER BY 1;
B. SELECT DISTINCT promo_category || ` has ' || promo_cost AS COSTS FROM promotions ORDER BY 1;
C. SELECT DISTINCT promo_category, promo_cost FROM promotions ORDER BY 1;
D. SELECT DISTINCT promo_cost ||` in '|| DISTINCT promo_category FROM promotions ORDER BY 1;
E. SELECT promo_category, DISTINCT promo_cost FROM promotions ORDER BY 2;

Answer: B,C

NEW QUESTION # 21
You execute these commands:
SQL> DEFINE hiredate = '01-APR -2011';
SQL> SELECT employee_id, first_name, salary FROM employees WHERE hire date > &hiredate AND manager_id >&mgr_id; For which substitution variables will you be prompted?

A. only &hiredate
B. only &mgr_id
C. none
D. &hiredate and &mgr_id

Answer: B

Explanation:
* D. only &mgr_id: Since the hiredate variable is already defined before the SELECT statement, you will not be prompted for &hiredate again. However, &mgr_id has not been defined, so you will be prompted for this substitution variable.

NEW QUESTION # 22
Examine the structure of the PROGRAMS table:

Which two SQL statements would execute successfully?

A. SELECT TO_DATE (NVL (SYSDATE-END_DATE, SYSDATE)) FROM programs;
B. SELECT NVL (ADD_MONTHS (END_DATE,1) SYSDATE) FROM programs;
C. SELECT NVL (MONTHS_BETWEEN (start_date, end_date), 'Ongoing') FROM programs;
D. SELECT NVL (TO_CHAR (MONTHS_BETWEEN (start-date, end_date)), 'Ongoing') FROM programs

Answer: B,D

NEW QUESTION # 23
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