Holly Giang | Sprint-Challenge--SQL

queries.sql

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+.mode column
+.header on
+
+
+CREATE TABLE organization (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name VARCHAR(128) NOT NULL UNIQUE,
+    created TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE channel (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name VARCHAR(128) NOT NULL UNIQUE,
+    organization_id INTEGER REFERENCES organization(id)
+);
+
+CREATE TABLE user (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name VARCHAR(128) NOT NULL UNIQUE
+);
+
+CREATE TABLE message (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    content TEXT,
+    user_id INTEGER REFERENCES user(id),
+    channel_id INTEGER REFERENCES channel(id),
+    created TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE user_channel (
+    user_id INTEGER REFERENCES user(id),
+    channel_id INTEGER REFERENCES channel(id)
+);
+
+
+
+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', 2);
+
+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 (2, 3);
+
+INSERT INTO message (content, user_id, channel_id) VALUES ('Have a great weekend!', 1, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES (':partypotato:', 1, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ('Ready for Lambda Labs', 1, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES ('SQL is too verbose for me', 1, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ('Happy Friday!', 2, 1);
+INSERT INTO message (content, user_id, channel_id) VALUES (':ultrafastparrot:', 2, 1 );
+INSERT INTO message (content, user_id, channel_id) VALUES (':coffeeparrot:', 3, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ('What is the weekly retro topic?', 3, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES (':lambdareps:', 1, 2);
+INSERT INTO message (content, user_id, channel_id) VALUES ('Almost done!', 2, 1);
+
+
+SELECT name FROM organization;
+SELECT name FROM channel;
+
+SELECT channel.name FROM channel, organization
+WHERE channel.organization_id = organization.id AND organization.name = "Lambda School";
+
+SELECT content FROM message, channel WHERE channel_id = channel.id AND channel.name = '#general'
+ORDER BY created DESC;
+
+SELECT content FROM message INNER JOIN user
+ON message.user_id IS user.id WHERE user.name IS 'Alice';
+
+SELECT content FROM message, user, channel
+WHERE user_id = user.id AND channel_id = channel.id AND channel.name = '#random' AND user.name = 'Bob';
+
+SELECT COUNT(user.id) AS "Message Count", user.name AS "User Name"
+FROM message INNER JOIN user ON message.user_id IS user.id
+INNER JOIN channel WHERE message.channel_id IS channel_id
+GROUP BY user.id;
+
+--- 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? --- 
+
+--- Answer: ON DELETE CASCADE ---