Valid Oracle 1z0-071 Test Pattern, Exam 1z0-071 Questions Answers

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Oracle 1z0-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: SQL Functions	- Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions - Single-row functions 1. Character, numeric, date functions
Topic 2: Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
Topic 3: SQL Retrieval	- SELECT statements and filtering data 1. ORDER BY and row limiting 2. WHERE clause and conditions - Joins and set operations 1. UNION, INTERSECT, MINUS 2. INNER, OUTER, CROSS joins
Topic 4: Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints
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 (Q295-Q300):

NEW QUESTION # 295
Examine the description of the EMPLOYEES table:

Which two statements will run successfully?

A. SELECT 'The first_name is ''' ||first_name||''' FROM employees ;
B. SELECT 'The first_name is '' || first_name || '' FROM employees ;
C. SELECT 'The first_name is '|| first_name|| '' FROM employees;
D. SELECT 'The first_name is '''||first_name ||'''' FROM employees ;
E. SELECT 'The first_name is \'' || first_name || '\'' FROM employees;

Answer: A,D

Explanation:
In Oracle SQL, to include single quotes in a string literal, you need to use two single-quote characters.
A . This statement will not run successfully because the single quotes are not properly escaped. After the text The first_name is , there should be two single quotes to start the string literal for the first name.
B . This statement will run successfully. It properly escapes the single quotes by using two single quotes around first_name. This will result in the output like The first_name is 'John'.
C . This statement will run successfully as well. The two single quotes after The first_name is and before FROM employees are correctly used to delimit the first name.
D . This statement will not run successfully. There is a missing single quote before the double pipe (||) operator, and at the end of the statement, only one single quote is used instead of two for escaping.
E . This statement will not run successfully because the backslash is not used to escape single quotes in Oracle SQL. The proper method is to use two single quotes without a backslash.
Reference:
Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Text Literals" Oracle Database SQL Language Reference, 12c Release 1 (12.1): "String Concatenation Operator"

NEW QUESTION # 296
View the Exhibit and examine the structure of the EMP table which is not partitioned and not an index-organized table. (Choose two.)

Evaluate this SQL statement:
ALTER TABLE emp
DROP COLUMN first_name;
Which two statements are true?

A. The FIRST_NAME column would be dropped provided at least one column remains in the table.
B. The FIRST_NAME column would be dropped provided it does not contain any data.
C. The drop of the FIRST_NAME column can be rolled back provided the SET UNUSED option is added to the SQL statement.
D. The FIRST_NAME column can be dropped even if it is part of a composite PRIMARY KEY provided the CASCADE option is added to the SQL statement.

Answer: A

NEW QUESTION # 297
The SALES table has columns PROD_IDand QUANTITY_SOLDof data type NUMBER.
Which two queries execute successfully? (Choose two.)

A. BY prod_id HAVING COUNT(*) > 10;
SELECT COUNT(prod_id) FROM sales WHERE quantity_sold > 55000 GROUP BY prod_id;
B. SELECT prod_id FROM sales WHERE quantity_sold > 55000 GROUP BY prod_id HAVING
C. COUNT(*) > 10;
SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP
D. BY COUNT(*) > 10;
SELECT COUNT(prod_id) FROM sales GROUP BY prod_id WHERE quantity_sold > 55000;
E. SELECT prod_id FROM sales WHERE quantity_sold > 55000 AND COUNT(*) > 10 GROUP

Answer: A,B

NEW QUESTION # 298
View the Exhibit and examine the structure of the EMP table which is not partitioned and not an index-organized table. (Choose two.)

Evaluate this SQL statement:
ALTER TABLE emp
DROP COLUMN first_name;
Which two statements are true?

A. The FIRST_NAME column would be dropped provided at least one column remains in the table.
B. The FIRST_NAME column would be dropped provided it does not contain any data.
C. The drop of the FIRST_NAME column can be rolled back provided the SET UNUSED option is added to the SQL statement.
D. The FIRST_NAME column can be dropped even if it is part of a composite PRIMARY KEY provided the CASCADE option is added to the SQL statement.

Answer: A

NEW QUESTION # 299
What is true about non-equijoin statement performance?

A. The BETWEEN condition always performs less well than using the >= and <= conditions.
B. The Oracle join syntax performs better than the SQL:1999 compliant ANSI join syntax.
C. The BETWEEN condition always performs better than using the >= and <= conditions.
D. The join syntax used makes no difference to performance.
E. Table aliases can improve performance.

Answer: D,E

NEW QUESTION # 300
......

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