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Oracle 1z1-071 Exam Syllabus Topics:

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

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Oracle Database SQL Sample Questions (Q299-Q304):

NEW QUESTION # 299
Examine this statement:
SELECT 1 AS id, ' John' AS first name
FROM DUAL
UNION
SELECT 1 , ' John' AS name
FROM DUAL
ORDER BY 1;
What is returned upon execution?

A. 1 row
B. 0 rows
C. an error
D. 2 rows

Answer: A

Explanation:
The statement provided uses the UNION operator, which combines the results of two or more queries into a single result set. However, UNION also eliminates duplicate rows. Both queries in the union are selecting the same values 1 and ' John', thus the result is one row because duplicates will be removed.
SELECT 1 AS id, ' John' AS first name FROM DUAL UNION SELECT 1 , ' John' AS name FROM DUAL ORDER BY 1; Given that both SELECT statements are actually identical in the values they produce, despite the differing column aliases, the UNION will eliminate one of the duplicate rows, resulting in a single row being returned.
Reference:
Oracle Documentation on UNION: SQL Language Reference - UNION

NEW QUESTION # 300
Examine this description of the EMP table:

You execute this query:
SELECT deptno AS "departments", SUM (sal) AS "salary"
FROM emp
GROUP | BY 1
HAVING SUM (sal)> 3 000;
What is the result?

A. only departments where the total salary is greater than 3000, returned in no particular order
B. all departments and a sum of the salaries of employees with a salary greater than 3000
C. only departments where the total salary is greater than 3000, ordered by department
D. an error

Answer: D

Explanation:
The query uses the syntax GROUP | BY 1 which is not correct. The pipe symbol | is not a valid character in the context of the GROUP BY clause. Additionally, when using GROUP BY with a number, it refers to the position of the column in the SELECT list, which should be written without a pipe symbol and correctly as GROUP BY 1. Since the syntax is incorrect, the database engine will return an error.

NEW QUESTION # 301
You need to display the first names of all customers from the CUSTOMERStable that contain the character 'e' and have the character 'a' in the second last position.
Which query would give the required output?
SELECT cust_first_name

A. FROM customers
WHERE INSTR(cust_first_name, 'e')<>0 AND
SUBSTR(cust_first_name, LENGTH(cust_first_name), -2)='a';
B. FROM customers
WHERE INSTR(cust_first_name, 'e')<>'' AND
SUBSTR(cust_first_name, -2, 1)='a';
SELECT cust_first_name
C. FROM customers
WHERE INSTR(cust_first_name, 'e')<>0 AND
SUBSTR(cust_first_name, -2, 1)='a';
SELECT cust_first_name
D. FROM customers
WHERE INSTR(cust_first_name, 'e')IS NOT NULL AND
SUBSTR(cust_first_name, 1, -2)='a';
SELECT cust_first_name

Answer: C

NEW QUESTION # 302
View the exhibit and examine the structure of the SALES, CUSTOMERS, PRODUCTS and TIMES tables.
The PROD_ID column is the foreign key in the SALES table referencing the PRODUCTS table.
The CUST_ID and TIME_ID columns are also foreign keys in the SALES table referencing the CUSTOMERS and TIMES tables, respectively.
Examine this command:
CREATE TABLE new_sales (prod_id, cust_id, order_date DEFAULT SYSDATE)
AS
SELECT prod_id, cust_id, time_id
FROM sales;
Which statement is true?

A. The NEW_SALES table would not get created because the DEFAULT value cannot be specified in the column definition.
B. The NEW_SALES table would get created and all the NOT NULL constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.
C. The NEW_SALES table would not get created because the column names in the CREATE TABLE command and the SELECT clause do not match.
D. The NEW_SALES table would get created and all the FOREIGN KEY constraints defined on the selected columns from the SALES table would be created on the corresponding columns in the NEW_SALES table.

Answer: B

NEW QUESTION # 303
View the Exhibit and examine the details of the PRODUCT_INFORMATION table.
Exhibit

You must display PRODUCT_NAME from the table where the CATEGORY_ID column has values 12 or 13, and the SUPPLIER_ID column has the value 102088.
You executed this SQL statement:

Which statement is true regarding the execution?

A. It would execute and return the desired result.
B. It would not execute because the entire WHERE clause is not enclosed within parentheses.
C. It would execute but would return no rows.
D. It would not execute because the same column has been used twice with the AND logical operator.

Answer: C

NEW QUESTION # 304
......

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