To give the answers to the above SQL theory questions, follow these instructions:
1. Read each question carefully to understand what is being asked.
2. Take some time to think about the answer before proceeding.
3. Once you have formulated your answer, write it down or type it out.
4. Compare your answer with the provided answer for each question.
5. If your answer matches the provided answer, move on to the next question.
6. If your answer does not match or you are unsure, review the question and the provided answer to understand the concept better.
7. Make any necessary corrections to your answer based on the provided answer.
8. Repeat the process for all ten questions, giving your best attempt at answering each one before checking the provided answer.
9. After answering all the questions, review any incorrect answers and try to understand the correct concepts.
10. Use this opportunity to learn from any mistakes and reinforce your knowledge of SQL.
Remember, answering these questions is a great way to test and enhance your theoretical understanding of SQL concepts.