Xang Thao

README.md

@@ -130,3 +130,7 @@ various tables, not just the columns listed here.
 6. 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?
+
+   I think it is CASCADE...
+
+* Initial commit

alice_channel.txt

@@ -0,0 +1,4 @@
+name      
+----------
+#general  
+#random   

all_channel.txt

@@ -0,0 +1,4 @@
+id          name        organization_id  created_at           updated_at         
+----------  ----------  ---------------  -------------------  -------------------
+1           #general    1                2018-09-07 17:12:34  2018-09-07 17:12:34
+2           #random     1                2018-09-07 17:12:34  2018-09-07 17:12:34

all_channel_from_lambda.txt

@@ -0,0 +1,4 @@
+name      
+----------
+#general  
+#random   

all_general_message.txt

@@ -0,0 +1,6 @@
+id          content            user_id     channel_id  post_time            update_post          id          name        organization_id  created_at           updated_at         
+----------  -----------------  ----------  ----------  -------------------  -------------------  ----------  ----------  ---------------  -------------------  -------------------
+1           first from  alice  1           1           2018-09-07 17:51:52  2018-09-07 17:51:52  1           #general    1                2018-09-07 17:39:21  2018-09-07 17:39:21
+4           first from bob     2           1           2018-09-07 17:51:52  2018-09-07 17:51:52  1           #general    1                2018-09-07 17:39:21  2018-09-07 17:39:21
+7           first from chris   3           1           2018-09-07 17:51:52  2018-09-07 17:51:52  1           #general    1                2018-09-07 17:39:21  2018-09-07 17:39:21
+8           second from chris  3           1           2018-09-07 17:51:52  2018-09-07 17:51:52  1           #general    1                2018-09-07 17:39:21  2018-09-07 17:39:21

all_organization.txt

@@ -0,0 +1,3 @@
+id          name           created_at         
+----------  -------------  -------------------
+1           Lambda School  2018-09-07 17:12:34

all_user_in_general_channel.txt

@@ -0,0 +1,4 @@
+name      
+----------
+Alice     
+Bob       

all_users_messages_count.txt

@@ -0,0 +1,5 @@
+User Name   Message Count
+----------  -------------
+Chris       4            
+Bob         3            
+Alice       3            

queries.sql

@@ -0,0 +1,59 @@
+CREATE TABLE organization(
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  name VARCHAR(128) NOT NULL UNIQUE,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE channel(
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  name VARCHAR(128) NOT NULL UNIQUE,
+  organization_id INTEGER REFERENCES organization(id),
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE user(
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  name VARCHAR(128) NOT NULL UNIQUE
+);
+
+CREATE TABLE user_channel(
+  user_id INTEGER REFERENCES user(id),
+  channel_id INTEGER REFERENCES channel(id)
+);
+
+CREATE TABLE message(
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  content TEXT,
+  user_id INTEGER REFERENCES user(id),
+  channel_id INTEGER REFERENCES channel(id),
+  post_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  update_post TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+INSERT INTO organization (name) VALUES ("Lambda School");
+
+INSERT INTO user (name) VALUES ("Alice");
+INSERT INTO user (name) VALUES ("Bob");
+INSERT INTO user (name) VALUES ("Chris");
+
+INSERT INTO channel (name, organization_id) VALUES ("#general", 1);
+INSERT INTO channel (name, organization_id) VALUES ("#random", 1);
+
+INSERT INTO user_channel (user_id, channel_id) VALUES (1, 1);
+INSERT INTO user_channel (user_id, channel_id) VALUES (1, 2);
+INSERT INTO user_channel (user_id, channel_id) VALUES (2, 1);
+INSERT INTO user_channel (user_id, channel_id) VALUES (3, 2);
+
+INSERT INTO message (content, user_id, channel_id) VALUES ("first from  alice", 1, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES ("second from alice", 1, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ("third from alice", 1, 2);
+
+INSERT INTO message (content, user_id, channel_id) VALUES ("first from bob", 2, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES ("second from bob", 2, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ("third from bob", 2, 2);
+
+INSERT INTO message (content, user_id, channel_id) VALUES ("first from chris", 3, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES ("second from chris", 3, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES ("third from chris", 3, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ("forth from chris", 3, 2);