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Oracle 1z1-071 (Oracle Database SQL) Certification Exam is an industry-recognized certification that validates the skills and knowledge of professionals in SQL database management. 1z0-071 exam is designed for database administrators, developers, and analysts who work with Oracle SQL databases. 1z0-071 Exam Tests the candidate's ability to write basic SQL queries, create database objects, and manage database data.

Oracle Database SQL Sample Questions (Q126-Q131):

NEW QUESTION # 126
Examine the command:

What does ON DELETE CASCADE Imply?

A. When the books table is dropped, all the rows in the BOOK_TRANSACTIONS table are deleted but the table structure is retained.
B. When the books table is dropped, the BOOK_TRANSACTIONS table is dropped.
C. When a row in the books table is deleted, the rows in the BOOK__TRANSACTIONS table whose BOOK_ID matches that of the deleted row in the books table are also deleted.
D. When a value in the BOOKS.BOOK_ID column is deleted, the corresponding value is updated in the books transactions. BOOK_ID column.

Answer: C

NEW QUESTION # 127
Examine the description or the BOOKS_TRANSACTIONS table:

FOR customers whose income level has a value, you want to display the first name and due amount as 5% of their credit limit. Customers whose due amount is null should not be displayed.
Which query should be used?

A. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND due_amount !=NULL;
B. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level IS NOT NULL
AND due_amount IS NOT NULL;
C. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust_income_level IS NOT NULL
AND cust_credit_limit IS NOT NULL;
D. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level <> NULL
AND due_amount <> NULL;
E. SELECT cust_first_name, cust_credit_limit * . 05 AS DUE AMOUNT
FROM customers
WHERE cust income_level !=NULL
AND cust credit_level !=NULL;

Answer: C

Explanation:
D: True. This query selects the first name and calculates the due amount as 5% of the credit limit from the customers table where the income level is not null and the credit limit is also not null. The IS NOT NULL operator is used to check for non-null values correctly.
* The IS NOT NULL operator is the correct way to check for non-null values in SQL. The <> NULL and
!= NULL comparisons are incorrect because NULL is not a value that can be compared using these operators; it represents the absence of a value.
* There is no due_amount column in the customers table according to the structure provided, so any WHERE clause referencing due_amount is irrelevant and incorrect. The due_amount is a derived column in the SELECT clause.
* The correct syntax to check for non-null values is IS NOT NULL, which is used in the WHERE clause of the correct answer.
References:
* The use of IS NOT NULL in the WHERE clause to filter out null values is documented in Oracle's SQL reference.
* NULL comparisons must be done with IS NULL or IS NOT NULL for correct logical evaluation in SQL.

NEW QUESTION # 128
Examine the structure of the SALES table.

Examine this statement:

Which two statements are true about the SALES1 table? (Choose two.)

A. It will have NOT NULL constraints on the selected columns which had those constraints in the SALES table.
B. It will not be created because the column-specified names in the SELECT and CREATE TABLE clauses do not match.
C. It has PRIMARY KEY and UNIQUE constraints on the selected columns which had those constraints in the SALES table.
D. It is created with no rows.
E. It will not be created because of the invalid WHERE clause.

Answer: A,D

NEW QUESTION # 129
Which three are true?

A. LAST_DAY returns the date of the last day of the current ,month onlyu.
B. ADD_MONTHS works with a character string that can be implicitlyt converted to a DATE data type.
C. CEIL returns the largest integer less than or equal to a specified number.
D. LAST_DAY return the date of the last day the previous month only.
E. LAST_DAY returns the date of the last day of the month for the date argument passed to the function.
F. ADD_MONTHS adds a number of calendar months to a date.
G. CEIL requires an argument which is a numeric data type.

Answer: E,F,G

NEW QUESTION # 130
Examine the commands used to create DEPARTMENT_DETAILS and
COURSE_DETAILS:
SQL>CREATE TABLE DEPARTMENT_DETAILS
(DEPARTMENT_ID NUMBER PRIMARY KEY,
DEPARTMENT_NAMEVARCHAR2(50),
HODVARCHAR2(50));
SQL>CREATE TABLE COURSE_DETAILS
(COURSE_IDNUMBER PRIMARY KEY,
COURSE_NAMEVARCHAR2(50),
DEPARTMENT_IDVARCHAR2(50));
You want to generate a list of all department IDs along with any course IDs that may have been assigned to them.
Which SQL statement must you use?

A. SELECT d.department_id, c.course_id FROM department_details d RIGHT OUTER JOIN course_details c ON (c.department_id=d. department_id);
B. SELECT d.department_id, c.course_id FROM course_details c LEFT OUTER JOIN department_details d ON (c.department_id=d. department_id);
C. SELECT d.department_id, c.course_id FROM department_details d RIGHT OUTER JOIN course_details c ON (d.department_id=c. department_id);
D. SELECT d.department_id, c.course_id FROM department_details d LEFT OUTER JOIN course_details c ON (d.department_id=c. department_id);

Answer: D

NEW QUESTION # 131
......

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Oracle Database SQL Sample Questions (Q126-Q131):

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