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Oracle 1z1-071 Exam Syllabus Topics:

Section	Objectives
Topic 1: Subqueries and Advanced SQL	- Single-row and multi-row subqueries - Correlated subqueries and nested queries
Topic 2: Relational Database Concepts	- Tables, rows, columns, and relational model basics - Data types and database objects overview
Topic 3: 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
Topic 4: SQL Functions	- Conversion and conditional functions 1. TO_CHAR, TO_NUMBER, CASE expressions - Single-row functions 1. Character, numeric, date functions
Topic 5: Data Manipulation and Schema Objects	- DML operations 1. INSERT, UPDATE, DELETE, MERGE - DDL operations 1. CREATE, ALTER, DROP tables and constraints

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Oracle Database SQL Sample Questions (Q201-Q206):

NEW QUESTION # 201
Which two statements are true about the DUAL table?

A. It can display multiple rows and columns.
B. It can display multiple rows but only a single column.
C. It can be accessed by any user who has the SELECT privilege in any schema
D. It can be accessed only by the SYS user.
E. It can be used to display only constants or pseudo columns.
F. It consists of a single row and single column of VARCHAR2 data type.

Answer: C,F

Explanation:
A). Incorrect. DUAL consists of a single row and column. B. Incorrect. DUAL is a special one-row, one-column table present by default in all Oracle database installations and can be accessed by any user with SELECT privilege. C. Correct. Any user with the SELECT privilege can select from the DUAL table. It is a dummy table used primarily for selecting a constant, pseudocolumn, or expression not involving any tables. D.
Incorrect. DUAL has only one row and one column. E. Correct. The DUAL table has a single VARCHAR2 column called DUMMY, which has a value of 'X'. F. Incorrect. DUAL can be used for a variety of purposes, such as selecting system constants, user environment variables, expressions, and sequences.
This information is detailed in the Oracle Database SQL Language Reference, which describes the properties and uses of the DUAL table.

NEW QUESTION # 202
The CUSTOMERStable has a CUST_CREDIT_LIMITcolumn of data type NUMBER.
Which two queries execute successfully? (Choose two.)

A. SELECT NVL2(cust_credit_limit, TO_CHAR(cust_credit_limit * .15), 'Not
B. SELECT TO_CHAR(NVL(cust_credit_limit * .15, 'Not Available')) FROM customers;
C. SELECT NVL(TO_CHAR(cust_credit_limit * .15), 'Not Available') FROM customers;
D. Available') FROM customers;
SELECT NVL2 (cust_credit_limit * .15, 'Not Available') FROM customers;
E. SELECT NVL (cust_credit_limit * .15, 'Not Available') FROM customers;

Answer: C,D

NEW QUESTION # 203
Which two statements are true about the COUNT function?

A. It can only be used for NUMBER data types.
B. COUNT(inv_amt) returns the number of rows in a table including rows with NULL in the INV_AMT column.
C. A SELECT statement using the COUNT function with a DISTINCT keyword cannot have a WHERE clause.
D. COUNT (DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULLs in the INV_AMT column
E. COUNT(*) returns the number of rows in a table including duplicate rows and rows containing NULLs in any column.

Answer: D,E

Explanation:
The COUNT function is one of the most commonly used aggregate functions in SQL for determining the number of items in a group. Here's why the correct answers are B and C:
* A: Incorrect. COUNT can be used with any data type, not just NUMBER. It counts rows without regard to data type.
* B: Correct. COUNT(DISTINCT inv_amt) counts the number of unique non-null values in the column inv_amt. It excludes duplicates and ignores NULL values.
* C: Correct. COUNT(*) counts all rows in a table, including those with duplicates and those with NULLs in any column. It is a total row count regardless of content.
* D: Incorrect. You can use a WHERE clause with COUNT. The WHERE clause filters rows before counting, which is standard in SQL.
* E: Incorrect. COUNT(inv_amt) counts the rows where inv_amt is not NULL. Rows with NULL in the inv_amt column are not counted.

NEW QUESTION # 204
Examine the description of the PRODUCTS table:

Which two statements execute without errors?

A. MERGE INTO new_prices n
USING products p
ON (p.prod_id =n.prod_id)
WHEN NOT MATCHED THEN
INSERT (n.prod _id, n.price) VALUES (p.prod_id, cost*.01)
WHERE (p.cost<200);
B. MERGE INTO new_prices n
USING (SELECT * FROM products) p
WHEN MATCHED THEN
UPDATE SET n.price= p.cost* 01
WHEN NOT MATCHED THEN
INSERT(n.prod_id, n.price) VALUES(p.prod_id, cost*.01)
WHERE(p.cost<200);
C. MERGE INTO new_prices n
USING (SELECT * FROM products WHERE cost>150) p
ON (n.prod_id= p.prod_id)
WHEN MATCHED THEN
DELETE WHERE (p.cost<200)
D. MERGE INTO new_prices n
USING (SELECT * FROM products WHERE cost>150) p
ON (n.prod_id= p.prod_id)
WHEN MATCHED THEN
UPDATE SET n.price= p.cost*.01
DELETE WHERE (p.cost<200);

Answer: A,D

NEW QUESTION # 205
Which statements are correct regarding indexes? (Choose all that apply.)

A. Indexes should be created on columns that are frequently referenced as part of any expression.
B. When a table is dropped, the corresponding indexes are automatically dropped.
C. A non-deferrable PRIMARY KEYor UNIQUE KEYconstraint in a table automatically creates a unique index.
D. For each DML operation performed, the corresponding indexes are automatically updated.

Answer: B,C,D

Explanation:
Explanation/Reference:
References:
http://viralpatel.net/blogs/understanding-primary-keypk-constraint-in-oracle/

NEW QUESTION # 206
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