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Oracle Database SQL Sample Questions (Q74-Q79):
NEW QUESTION # 74
Examine the description of the EMPLOYEES table:
Which statement will execute successfully, returning distinct employees with non-null first names?
- A. SELECT Distinct * FROM employees WHERE first_ name < > NULL;
- B. SELECT DISTINCT * FROM employees WHERE first_ name IS NOT NULL;
- C. SELECT first_ name, DISTNCT last_ name FROM employees WHERE first_ name IS NOT NULL;
- D. SELECT first_ name, DISTINCT last_ name FROM employees WHERE first_ name < > NULL;
Answer: B
NEW QUESTION # 75
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(100),
Hire_date DATE,
CONSTRAINT emp_id_uk UNIQUE (employee_id, login_id);
CONSTRAINT emp_id_nn NOT NULL (employee_id, login_id));
- D. 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));
- 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,D
NEW QUESTION # 76
View the Exhibit and examine the data in the PRODUCTStable.
Which statement would add a column called PRICE, which cannot contain NULL?
ALTER TABLE products
- A. ADD price NUMBER(8,2) DEFAULT 0 NOT NULL;
ALTER TABLE products
- B. ADD price NUMBER(8,2) DEFAULT CONSTRAINT p_nn NOT NULL.
- C. ADD price NUMBER(8,2) NOT NULL;
ALTER TABLE products
- D. ADD price NUMBER(8,2) DEFAULT NOT NULL;
ALTER TABLE products
Answer: A
Explanation:
Explanation
NEW QUESTION # 77
Which two statements are true about selecting related rows from two tables based on entity relationship diagram (ERD)?
- A. Implementing a relationship between two tables might require joining additional tables.
- B. Rows from unrelated tables cannot be joined.
- C. An inner join relates rows within the same table.
- D. Relating data from a table with data from the same table is implemented with a self join.
- E. Every relationship between the two tables must be implemented in a Join condition.
Answer: A,D
NEW QUESTION # 78
Which two statements will convert the string Hello world to ello wozid?
- A. SELECT INITCAP(TRIM('H' FROM 'Hello World')) FROM DUAL;
- B. SELECT LOWER(TRIM('H' FROM 'Hello World')) FROM DUAL;
- C. SELECT LOWER (SUBSTR('Hello World', 2)) FROM DUAL;
- D. SELECT LOWER (SUBSTR('Hello World, 2, 1)) FROM DUAL;
- E. SELECT SUBSTR('Hello world', 2) FROM DUAL;
Answer: C,E
Explanation:
To convert the string "Hello World" to "ello wozid":
Option B: SELECT LOWER(SUBSTR('Hello World', 2)) FROM DUAL;
This will remove the first character and convert the rest to lowercase, but it will not change the 'rld' to 'zid'.
Option D: SELECT SUBSTR('Hello world', 2) FROM DUAL;
This will remove the first character, but the rest of the string remains unchanged and not converted to lowercase.
Options A, C, and E are incorrect because:
Option A: SUBSTR is incorrect here because it is only getting one character instead of the entire string minus the first character.
Option C: While TRIM removes the 'H', LOWER converts all characters to lowercase, but it doesn't address the 'rld' to 'zid' change.
Option E: INITCAP and TRIM will not achieve the desired conversion of 'rld' to 'zid'.
NEW QUESTION # 79
......
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