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Oracle Database SQL Sample Questions (Q70-Q75):

NEW QUESTION # 70
You executed the following CREATE TABLE statement that resulted in an error:
SQL> CREATE TABLE employees(emp_id NUMBER(10) PRIMARY KEY, ename VARCHAR2(20), email NUMBER(3) UNIQUE, address VARCHAR2(500), phone VARCHAR2(20), resume LONG, hire_date DATE, remarks LONG, dept_id NUMBER(3) CONSTRAINT emp_dept_id_fk REFERENCES departments (dept_id), CONSTRAINT ename_nn NOY NULL(ename));
Identify two reasons for the error.

A. The NOT NULL constraint on the ENAME column must be defined as the column level
B. Only one LONG column can be used per table
C. The PRIMARY KEY constraint in the EMP_ID column must have a name and must be defined at the table level only
D. The FOREIGN KEY keyword is missing in the constraint definition
E. FOREIGN KEY defined on the DEPT_ID column must be at the table level only

Answer: A,B

NEW QUESTION # 71
Which two statements best describe the benefits of using the WITH clause? (Choose two.)

A. It enables sessions to store a query block permanently in memory and use it to create complex queries.
B. It can improve the performance of a large query by storing the result of a query block having the WITH clause in the session's temporary tablespace.
C. It enables sessions to store the results of a query permanently.
D. It enables sessions to reuse the same query block in a SELECT statement, if it occurs more than once in a complex query.

Answer: B,D

NEW QUESTION # 72
Which two are true about creating tables in an Oracle database?

A. A create table statement can specify the maximum number of rows the table will contain.
B. A primary key constraint is manadatory.
C. The same table name can be used for tables in different schemas.
D. A system privilege is required.
E. Creating an external table will automatically create a file using the specified directory and file name.

Answer: C,D

Explanation:
Regarding creating tables in an Oracle database:
* B. The same table name can be used for tables in different schemas: In Oracle, a schema is essentially a namespace within the database; thus, the same table name can exist in different schemas without conflict, as each schema is distinct.
* C. A system privilege is required: To create tables, a user must have the necessary system privileges, typically granted explicitly or through roles such as CREATE TABLE or administrative privileges depending on the environment setup.
Incorrect options for all three repeated questions:
* A: Oracle SQL does not allow specifying the maximum number of rows directly in a CREATE TABLE statement; this is controlled by storage allocation and database design rather than table creation syntax.
* D: Creating an external table does not create the physical file. It merely creates a table structure that allows access to data stored in an external file specified in the directory; the file itself must already exist or be managed outside of Oracle.
* E: A primary key constraint is not mandatory for creating tables. While it is a common practice to define a primary key to enforce entity integrity, it is not required by the Oracle SQL syntax for table creation.
These answers and explanations are aligned with Oracle Database 12c SQL documentation and standard practices.

NEW QUESTION # 73
These are the steps for a correlated subquery, listed in random order:
* The WHERE clause of the outer query is evaluated.
* A candidate row is fetched from the table specified in the outer query.
* This is repeated for the subsequent rows of the table, until all the rows are processed.
* Rows are returned by the inner query, after being evaluated with the value from the candidate row in the outer query.
Which is the correct sequence in which the Oracle server evaluates a correlated subquery?

A. 2, 1, 4, 3
B. 4, 1, 2, 3
C. 2, 4, 1, 3
D. 4, 2, 1, 3

Answer: C

Explanation:
Explanation
References:
http://rajanimohanty.blogspot.co.uk/2014/01/correlated-subquery.html

NEW QUESTION # 74
You must create a table EMPLOYEES in which the values in the columns EMPLOYEES_ID and LOGIN_ID must be unique and not null.
Which two SQL statements would create the required table? (Choose two.)

A. CREATE TABLE employees
(employee_id NUMBER CONSTRAINT emp_id_nn NOT NULL,
Login_id NUMBER CONSTRAINT login_id_nn NOT NULL,
Employee_name VARCHAR2(100),
Hire_date DATE,
CONSTRAINT emp_id_ukUNIQUE (employee_id, login_id));
B. CREATE TABLE employees
(employee_id NUMBER,
Login_id NUMBER,
Employee_name VARCHAR2(100),
Hire_date DATE,
CONSTRAINT emp_id_ukUNIQUE (employee_id, login_id));
C. CREATE TABLE employees
(employee_id NUMBER,
login_id NUMBER,
employee_name VARCHAR2(25),
hire_date DATE,
CONSTRAINT emp_id_pk PRIMARY KEY (employee_id, login_id));
D. CREATE TABLE employees
(employee_id NUMBER,
Login_id NUMBER,
Employee_name VARCHAR2(100),
Hire_date DATE,
CONSTRAINT emp_id_uk UNIQUE (employee_id, login_id);
CONSTRAINT emp_id_nn NOT NULL (employee_id, login_id));
E. CREATE TABLE employees
(employee_id NUMBER CONSTRAINT emp_id_pk PRIMARY KEY,
Login_id NUMBER UNIQUE,
Employee_name VARCHAR2(25),
Hire_date DATE);

Answer: A,C

NEW QUESTION # 75
......

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Marvelous 1z1-071 Pdf Dumps - Win Your Oracle Certificate with Top Score

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Oracle Database SQL Sample Questions (Q70-Q75):

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