1. | SUM() function returns the sum of the expression. | |||

2. | SUM() the commission | |||

3. | Sum by group | |||

4. | Some aggregate functions can still produce NULL as a result. | |||

5. | What is the total amount of mail traffic and the average size of each message? | |||

6. | What is the total population of the United States? | |||

7. | Summaries and NULL Values | |||

8. | To determine how many drivers were on the road and how many miles were driven each day | |||

9. | Finding Smallest or Largest Summary Values | |||

10. | The number of votes for each programming language is determined with SUM(IF(...)) | |||

11. | To compute the runner's average speed at the end of each stage |

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