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| Section | Objectives |
|---|---|
| Topic 1: Using Subqueries | - Use correlated subqueries - Use single-row subqueries - Use multiple-row subqueries |
| Topic 2: Using Set Operators | - Use UNION, UNION ALL, INTERSECT, and MINUS operators |
| Topic 3: Using Joins | - Use outer joins (LEFT, RIGHT, FULL) - Use equijoins and non-equijoins - Use self-joins - Use cross joins |
| Topic 4: Using DDL Statements | - Create and manage constraints - Create and manage sequences - Create and manage views - Create and manage indexes - Create and manage tables |
| Topic 5: Using SQL Functions | - Use character, number, and date functions in SELECT statements - Use conversion functions |
| Topic 6: Controlling User Access | - Grant and revoke privileges - Create and manage roles - Differentiate system privileges from object privileges |
| Topic 7: Using DML Statements | - Use the MERGE statement - Control transactions - Update rows in a table - Delete rows from a table - Insert rows into a table |
| Topic 8: Using SELECT Statements | - Use the WHERE clause to restrict rows - Execute a basic SELECT statement - Use the ORDER BY clause to sort rows - Use the FETCH clause to limit rows returned |
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 a primary key and a NOT NULL constraint
D) Creates a table with only VARCHAR2 and DATE columns
2. Which SQL function converts a string representation of a date into a date data type?
A) CAST_TO_DATE
B) TO_DATE
C) CONVERT_TO_DATE
D) DATE_CONVERT
3. What is the result of using the following SQL query?
SELECT 100 + NULL AS result;
A) 0
B) 100
C) NULL
D) An error
4. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;
A) The full date in the session time zone
B) An error due to incorrect syntax
C) The current year in the database time zone
5. What does the following SQL query return?
SELECT employee_id, salary * 12 AS annual_salary FROM employees;
A) Monthly salaries of all employees
B) Salaries multiplied by 12 and stored in a new table
C) Only employees with salaries greater than 12
D) Employee IDs and their annual salaries
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: B | Question # 3 Answer: C | Question # 4 Answer: C | Question # 5 Answer: D |
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