title: How to combine multiple queries into one query and the solution should be independent of other
body: <ol>
  <li>How many orders has the customer placed in the entire history?</li>
  <li>What is the average value of orders placed by customers?</li>
  <li>How many orders customer has placed which had order value more than 5000?</li>
  </ol>
  <p>So in this case, I have to write a query with 3 different columns from the same table called Orders. How do I do that, because 1st and 3rd subpoint will manipulate each other in the solution.</p>
  <p>Columns are CustomerID, OrderID, OrderValue, District, Date</p>