Christina Kopecky

[ckopecky]

• Add a file called queries.sql that runs all of the CREATE TABLE,
  INSERT, and SELECT queries, below.

Details

• Write CREATE TABLE statements for these relationships:

  • 1. organization. This table should at least have column(s):

    • name

  • 2. channel. This table should at least have column(s):
    * name

  • 3. user. This table should at least have column(s):
    * name

  • 4. message. This table should have at least columns(s):

                * `post_time`--the timestamp of when the message was posted
                * `content`--the message content itself
    

• Add additional foreign keys needed to the above tables, if any.

• Add additional join tables needed, if any.

• Write INSERT queries to add information to the database.

• 1. One organization, Lambda School

• 2. Three users, Alice, Bob, and Christina

• 3. Two channels, #general and #random

• 4. 10 messages (at least one per user, and at least one per channel).

• 5. Alice should be in #general and #random.

• 6. Bob should be in #general.

• 7. Christina should be in #random.

• Write SELECT queries to:

  • 1. List all organization names.

  • 2. List all channel names.

  • 3. List all channels in a specific organization by organization name.

  • 4. List all messages in a specific channel by channel name #general in
    order of post_time, descending. (Hint: ORDER BY. Because your
    INSERTs might have all taken place at the exact same time, this might
    not return meaningful results. But humor us with the ORDER BY anyway.)

  • 5. List all channels to which user Alice belongs.

  • 6. List all users that belong to channel #general.

  • 7. List all messages in all channels by user Alice.

  • 8. List all messages in #random by user Bob.

  • 9. List the count of messages across all channels per user. (Hint:
    COUNT, GROUP BY.)

  • 10. The title of the user's name column should be User Name and the title of
    the count column should be Message Count. (The SQLite commands
    .mode column and .header on might be useful here.)

  • 11. The user names should be listed in reverse alphabetical order.

    Example:

    User Name   Message Count
    ----------  -------------
    Christina       4
    Bob         3
    Alice       3
    

• What SQL keywords or concept would you use if you wanted to automatically
  delete all messages by a user if that user were deleted from the user
  table?

  ---

[Stretch!] List the count of messages per user per channel.

   Example:

   ```
   User        Channel     Message Count
   ----------  ----------  -------------
   Alice       #general    1
   Bob         #general    1
   Chris       #general    2
   Alice       #random     2
   Bob         #random     2
   Chris       #random     2
   ```

[JohnJustinn]

Thorough work showing mastery of the topic. Very impressive!