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1. What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);
A) Creates a table with no constraints
B) Creates a temporary table
C) Creates a table with only VARCHAR2 and DATE columns
D) Creates a table with a primary key and a NOT NULL constraint
2. What is the purpose of a correlated subquery?
A) A subquery that combines data from multiple tables
B) A subquery that depends on the result of another subquery
C) A subquery that can be used only with aggregate functions
D) A subquery that references columns from the outer query
3. What is a sequence in Oracle Database?
A) A type of index used for sorting rows
B) A predefined set of SQL queries executed in order
C) A list of numbers stored in a table
D) A database object that generates a series of unique numeric values
4. What happens when the TRUNCATE TABLE statement is executed?
A) Deletes the table structure permanently
B) Deletes all rows in the table and logs the operation for rollback
C) Deletes all rows in the table without logging the operation for rollback
D) Deletes only the last row in the table
5. Which of the following statements creates an ascending sequence starting at 100 and incrementing by 10?
A) CREATE SEQUENCE seq_1 START WITH 10 INCREMENT BY -100;
B) CREATE SEQUENCE seq_1 START WITH 100 INCREMENT BY -10;
C) CREATE SEQUENCE seq_1 START WITH 100 INCREMENT BY 10;
D) CREATE SEQUENCE seq_1 START WITH 10 INCREMENT BY 100;
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: D | Question # 4 Answer: C | Question # 5 Answer: C |
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