Write SQL SELECT statements to answer the following questions. **Make sure you save your code somewhere for future reference.** Note that an empty query result may not necessarily indicate an error. If you find there are no data in your schema that satisfy a query, insert some that do and try again.
1.	List all sites in order of region and description.
2.	List all samples that have comments, in reverse date order. (Hint: Look at the IS NULL operator.)
3.	List the site ID, region, description, latitude and longitude of sites whose altitude is between 0 and 100 metres. Save this query as a view called Low_Altitude_Sites.  
What happens to sites that have no (i.e., null) altitude, and why? 	
	
4.	Find the mobile phone numbers of scientists Terry Towel and Jane Smith (using their name, not ID!).