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| Section | Objectives |
|---|---|
| Controlling User Access | - Grant and revoke privileges - Differentiate system privileges from object privileges - Create and manage roles |
| Using Joins | - Use self-joins - Use equijoins and non-equijoins - Use cross joins - Use outer joins (LEFT, RIGHT, FULL) |
| Using SQL Functions | - Use conversion functions - Use character, number, and date functions in SELECT statements |
| Using DDL Statements | - Create and manage indexes - Create and manage views - Create and manage sequences - Create and manage constraints - Create and manage tables |
| Using DML Statements | - Use the MERGE statement - Insert rows into a table - Delete rows from a table - Update rows in a table - Control transactions |
| Using SELECT Statements | - Use the WHERE clause to restrict rows - Use the FETCH clause to limit rows returned - Execute a basic SELECT statement - Use the ORDER BY clause to sort rows |
| Using Subqueries | - Use multiple-row subqueries - Use correlated subqueries - Use single-row subqueries |
| Using Set Operators | - Use UNION, UNION ALL, INTERSECT, and MINUS operators |
1. What will the following SQL query do?
UPDATE employees
SET salary = salary * 1.1
WHERE department_id = 10;
A) Increase the salary of employees in department 10 by 10%
B) Decrease the salary of employees in department 10 by 10%
C) Set the salary to 1.1 for employees in department 10
D) Increase the salary of all employees by 10%
2. What does the INTERSECT operator do in SQL?
A) Returns rows from the first query that are not present in the second query
B) Combines rows from two queries and includes all duplicates
C) Returns rows that are present in both queries
D) Combines all rows from two queries without any conditions
3. What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;
A) Lists employees who are not managers
B) Lists employees without departments
C) Lists employees and their corresponding managers
D) Lists employees who are managers
4. What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;
A) The current date in the default system format
B) The time part of the current date
C) The current date in the format 'DD-MM-YYYY'
D) An error
5. Which INTERVAL data type would you use to store a period of time in years and months?
A) INTERVAL YEAR TO MONTH
B) INTERVAL DAY TO SECOND
C) INTERVAL MONTH TO DAY
D) INTERVAL MINUTE TO HOUR
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: C | Question # 3 Answer: C | Question # 4 Answer: C | Question # 5 Answer: A |
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