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AD Faris SC-SQL #80

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ece65d7
AD Faris SC-SQL
adfaris Sep 7, 2018
71d6069
Created Table and inserting records
adfaris Sep 7, 2018
49c2337
Completed the SQL SC
adfaris Sep 7, 2018
e149583
made some correction on syntax
adfaris Sep 7, 2018
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Binary file added LambdaChat.db
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187 changes: 187 additions & 0 deletions queries.sql
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Original file line number Diff line number Diff line change
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CREATE TABLE organization(
organization_id INTEGER PRIMARY KEY AUTOINCREMENT,
organization_name VARCHAR(50) NOT NULL UNIQUE
);

CREATE TABLE channel(
channel_id INTEGER PRIMARY KEY AUTOINCREMENT,
channel_name VARCHAR(50),
organization_id INTEGER
NOT NULL REFERENCES organization(organization_id)
);

CREATE TABLE user(
u_id INTEGER PRIMARY KEY AUTOINCREMENT,
username VARCHAR(50),
firstname VARCHAR(50),
lastname VARCHAR(50)
);

CREATE TABLE message(
message_id INTEGER PRIMARY KEY AUTOINCREMENT,
message_content VARCHAR(128),
u_id INTEGER NOT NULL REFERENCES user(u_id),
channel_id INTEGER NOT NULL REFERENCES channel(channel_id),
post_time timestamp DATE DEFAULT(DATETIME('NOW', 'LOCALTIME'))
);

CREATE TABLE channel_user(
u_id INTEGER REFERENCES user(u_id),
channel_id INTEGER REFERENCES channel(channel_id)
);

INSERT INTO organization(organization_name) VALUES('PFIZER');
INSERT INTO organization(organization_name) VALUES('ALU');
INSERT INTO organization(organization_name) VALUES('Lambda School');
INSERT INTO organization(organization_name) VALUES('NOKIA');

INSERT INTO user(username, firstname, lastname) VALUES('alicejones','Alice','Johns');
INSERT INTO user(username, firstname, lastname) VALUES('bobM','Bob','Marley');
INSERT INTO user(username, firstname, lastname) VALUES('ChrisR','Chris','Rock');

INSERT INTO channel(channel_name, organization_id) VALUES('#random', 1);
INSERT INTO channel(channel_name, organization_id) VALUES('#general', 1);
INSERT INTO channel(channel_name, organization_id) VALUES('#general #random', 1);
INSERT INTO channel(channel_name, organization_id) VALUES('#general', 2);
INSERT INTO channel(channel_name, organization_id) VALUES('#random', 2);
INSERT INTO channel(channel_name, organization_id) VALUES('#general #random', 2);


INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege1 with uid 1 and channel id 1 ', 1, 1);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege2 with uid 2 and channel id 1 ', 2, 1);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege3 with uid 3 and channel id 1 ', 3, 1);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege4 with uid 3 and channel id 2 ', 3, 2);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege5 with uid 2 and channel id 2 ', 2, 2);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege6 with uid 1 and channel id 2 ', 1, 2);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege6 with uid 1 and channel id 3 ', 1, 3);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege6 with uid 2 and channel id 3 ', 2, 3);
INSERT INTO message(message_content, u_id, channel_id) VALUES('Content of messege6 with uid 3 and channel id 3 ', 3, 3);


INSERT INTO channel_user(u_id, channel_id) VALUES(1,1);
INSERT INTO channel_user(u_id, channel_id) VALUES(2,1);
INSERT INTO channel_user(u_id, channel_id) VALUES(3,1);
INSERT INTO channel_user(u_id, channel_id) VALUES(1,2);
INSERT INTO channel_user(u_id, channel_id) VALUES(2,2);
INSERT INTO channel_user(u_id, channel_id) VALUES(3,2);
INSERT INTO channel_user(u_id, channel_id) VALUES(1,2);
INSERT INTO channel_user(u_id, channel_id) VALUES(2,2);
INSERT INTO channel_user(u_id, channel_id) VALUES(3,2);

-- 1. List all organization `name`s.
SELECT * FROM organization;
-- organization_id organization_name
-- --------------- -----------------
-- 1 Lambda School
-- 2 NOKIA
-- 3 ALU
-- 4 PFIZER

-- 2. List all channel `name`s.
SELECT channel_name FROM channel;
-- channel_name
-- ------------
-- #general
-- #random
-- #general #random

-- List all channels in a specific organization by organization `name`.
SELECT channel_name, organization_name
FROM channel C JOIN organization O
ON C.organization_id = O.organization_id;
-- channel_name organization_name
-- ------------ -----------------
-- #general Lambda School
-- #random Lambda School
-- #general #random Lambda School
-- #general #random NOKIA
-- #general NOKIA
-- #random NOKIA

-- List all messages in a specific channel by channel `name` `#general` in order of `post_time`, descending. (Hint: `ORDER BY`. Because your
-- `INSERT`s might have all taken place at the exact same time, this might not return meaningful results. But humor us with the `ORDER BY` anyway.)
SELECT *
FROM message M JOIN channel C
ON M.channel_id = C.channel_id
WHERE channel_name='#general'
ORDER BY post_time DESC;
-- message_id message_content u_id channel_id post_time channel_id channel_name organization_id
-- ---------- ------------------------------------------------ ---------- ---------- ------------------- ---------- ------------ ---------------
-- 3 Content of messege3 with uid 3 and channel id 1 3 1 2018-09-07 12:10:52 1 #general 1
-- 2 Content of messege2 with uid 2 and channel id 1 2 1 2018-09-07 12:10:37 1 #general 1
-- 1 Content of messege1 with uid 1 and channel id 1 1 1 2018-09-07 12:10:19 1 #general 1

-- 5. List all channels to which user `Alice` belongs.
SELECT *
FROM channel C JOIN channel_user CU
ON C.channel_id = CU.channel_id
JOIN user U
ON U.u_id = CU.u_id
WHERE U.firstname = 'Alice';
-- channel_id channel_name organization_id u_id channel_id u_id username firstname lastname
-- ---------- ------------ --------------- ---------- ---------- ---------- ---------- ---------- ----------
-- 1 #general 1 1 1 1 alicejones Alice Johns
-- 2 #random 1 1 2 1 alicejones Alice Johns
-- 3 #general #ra 1 1 3 1 alicejones Alice Johns

-- 6. List all users that belong to channel `#general`.
SELECT * FROM user U JOIN channel_user CU
ON U.u_id = CU.u_id JOIN channel C
ON C.channel_id = CU.channel_id
WHERE channel_name= '#general';
-- u_id username firstname lastname u_id channel_id channel_id channel_name organization_id
-- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ------------ ---------------
-- 1 alicejones Alice Johns 1 1 1 #general 1
-- 2 bobM Bob Marley 2 1 1 #general 1
-- 3 ChrisR Chris Rock 3 1 1 #general 1

-- 7. List all messages in all channels by user `Alice`.
SELECT * FROM
channel C JOIN message M
ON M.channel_id = C.channel_id
JOIN user U
ON U.u_id = M.u_id
WHERE U.firstname= 'Alice';
-- channel_id channel_name organization_id message_id message_content u_id channel_id post_time u_id username firstname lastname
-- ---------- ------------ --------------- ---------- ------------------------------------------------ ---------- ---------- ------------------- ---------- ---------- ---------- ----------
-- 1 #general 1 1 Content of messege1 with uid 1 and channel id 1 1 1 2018-09-07 12:10:19 1 alicejones Alice Johns
-- 2 #random 1 6 Content of messege5 with uid 3 and channel id 3 1 2 2018-09-07 12:12:16 1 alicejones Alice Johns
-- 3 #general #ra 1

-- 8. List all messages in `#random` by user `Bob`.
SELECT * FROM channel C JOIN message M
ON M.channel_id = C.channel_id JOIN user U
ON U.u_id = M.u_id
WHERE U.firstname= 'Bob' AND C.channel_name ='#random';
-- channel_id channel_name organization_id message_id message_content u_id channel_id post_time u_id username firstname lastname
-- ---------- ------------ --------------- ---------- ------------------------------------------------ ---------- ---------- ------------------- ---------- ---------- ---------- ----------
-- 2 #random 1 5 Content of messege5 with uid 2 and channel id 2 2 2 2018-09-07 12:11:53 2 bobM Bob Marley


-- 9. List the count of messages across all channels per user. (Hint:`COUNT`, `GROUP BY`.)
SELECT U.firstname AS 'User Name', COUNT(*) AS 'Message Count'
FROM channel C JOIN message M
ON M.channel_id = C.channel_id JOIN user U
ON U.u_id = M.u_id
GROUP BY(U.u_id);
-- User Name Message Count
-- ---------- -------------
-- Alice 3
-- Bob 4
-- Chris 2

-- 10. [Stretch!] List the count of messages per user per channel.
SELECT U.firstname AS 'User Name', channel_name AS 'Channel', COUNT(*) AS 'Message Count'
FROM channel C JOIN message M
ON M.channel_id = C.channel_id JOIN user U
ON U.u_id = M.u_id
GROUP BY( C.channel_id);
-- User Name Channel Message Count
-- ---------- ---------- -------------
-- Chris #general 3
-- Alice #random 3
-- Bob #general # 3

-- 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?
-- the term is cascade, once the cascade on delete is set on the table, when all messages are deleted all related user info will be deleted with it, keeping the integrity and
-- consistancy of the database.