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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Subqueries and Advanced SQL	- Correlated subqueries and nested queries - Single-row and multi-row subqueries
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
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
SQL Functions	- Single-row functions 1. Character, numeric, date functions - Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions

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Oracle Database SQL Sample Questions (Q40-Q45):

NEW QUESTION # 40
Which two statements are true regarding the EXISTSoperator used in the correlated subqueries?
(Choose two.)

A. It is used to test whether the values retrieved by the outer query exist in the result set of the inner query.
B. The outer query stops evaluating the result set of the inner query when the first value is found.
C. It is used to test whether the values retrieved by the inner query exist in the result of the outer query.
D. The outer query continues evaluating the result set of the inner query until all the values in the result set are processed.

Answer: A,B

Explanation:
Explanation/Reference:
References:
http://www.techonthenet.com/oracle/exists.php

NEW QUESTION # 41
Which two are true?

A. CONCAT joins two or more character strings together.
B. INSTR finds the offset within a character string, starting from position 0.
C. FLOOR returns the largest positive integer less than or equal to a specified number.
D. CONCAT joins two character strings together.
E. INSTR finds the offset within a string of a single character only.
F. FLOOR returns the largest integer less than or equal to a specified number.

Answer: D,F

NEW QUESTION # 42
Which three statements are true about indexes and their administration in an Oracle database?

A. A UNIQUE and non-unique index can be created on the same table column.
B. A DROP INDEX statement always prevents updates to the table during the drop operation.
C. A descending index is a type of function-based index.
D. An INVISIBLE index is not maintained when Data Manipulation Language (DML) is performed on its underlying table.
E. An index can be created as part of a CREATE TABLE statement.
F. If a query filters on an indexed column then it will always be used during execution of the query.

Answer: C,D,E

NEW QUESTION # 43
The INVOICE table has a QTY_SOLD column of data type NUMBER and an INVOICE_DATE column of data type DATE NLS_DATE_FORMAT is set to DD-MON-RR.
Which two are true about data type conversions involving these columns in query expressions?

A. invoice_date = '15-march-2019': uses implicit conversion
B. invoice_date> '01-02-2019': uses implicit conversion
C. qty_sold ='05549821 ': requires explicit conversion
D. CONCAT(qty_sold, invoice_date): requires explicit conversion
E. qty_sold BETWEEN '101' AND '110': uses implicit conversion

Answer: A,B

Explanation:
The statements regarding data type conversions and the treatment of literals in SQL expressions involve understanding implicit and explicit data conversions in Oracle SQL.
Statement A is true as invoice_date > '01-02-2019' involves an implicit conversion of the string literal to a date type, based on the NLS_DATE_FORMAT setting, assuming the format matches.
Statement E is true because, similarly to A, invoice_date = '15-march-2019' involves an implicit conversion where the string is automatically converted to a date type according to the Oracle NLS_DATE_FORMAT or an assumed default date format.
Statements B, C, and D involve incorrect or misleading information:
B (qty_sold = '05549821') is misleading and potentially incorrect as leading zeros in a numeric context do not typically require explicit conversion but the presence of spaces might suggest a need for trimming rather than numeric conversion.
C (CONCAT(qty_sold, invoice_date)) would indeed require explicit conversion because CONCAT expects string types, and thus numerical and date values must be explicitly converted to strings before concatenation.
D (qty_sold BETWEEN '101' AND '110') uses implicit conversion where the string literals '101' and '110' are implicitly converted to numbers if qty_sold is a numeric type.

NEW QUESTION # 44
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 salary + 120.50 FROM employees;
B. SELECT SUBSTR(join date, 1, 2)- 10 FROM employees;
C. SELECT join date FROM employees where join date > *10-02-2018*;
D. SELECT join date 11.'11 salary FROM employees;
E. SELECT join date + 20 FROM employees;

Answer: C

NEW QUESTION # 45
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