Database Questions

1. What is returned from a table when using the following SQL ' Select * from tableName'

2. What does giving a field an alias look like? Give an example

3. When reading data from a database, you can make a "computed column", give an example where this would be used

4. What are the rules of precedence? (remember your algebra), why are they important?

5. Why is it important to store data in a database as the type of data it is?

6. What SQL clause is used to list all unique values?

7. What is the preferred choice of join? Why? (three types, Join On, Join Using, Natural Join)

8. Give 3 reasons you may want to alias a table name in a query?

9. When is it required to give a table name an alias?

10. What is the default way a database will order data when using an order by?

11. What SQL syntax do you want to use if you want to order items in "reverse" order?

12. If you wanted to retrieve all results from a table (person) that had your same last name (lname), what would the conditional restriction syntax be?

13. Would you have to use quotes in your conditional statement if your data was classified as numeric?

14. What does an OR do in SQL?

15. What does an AND do in SQL?

16. Why are parenthesis important when using AND and OR statements?

17. What operator would you use if you wanted to retreive all values in a table, but exclude one result? (example, give me all values in the student table except the students with the last name of 'Leonard')

18. What one word operator would you use if you wanted to retreive all values that greater than 10 but less than 20?

19 . What operator would you use if you wanted to retreive all values in a table that started with 'Smi'?

20. What operator would you use to return all values in a table that are null?