This was done as a database design course project at Amirkabir university of technology. This is a relational database management system that is built using MySQL and works with CLI in python.

This project contains the following files:

• tables.sql: A DDL script to generate relational tables for our mini-twitter schema including relevant constraints.

• procedures.sql: Several procedures to perform complex queries.

• triggers.sql: Some triggers that are sensitive to a particular event and perform specific tasks as they occur.

• Relational_schema.png: Relational Schema to better visualize relations among the tables.

• database.py: A user interface through which we can communicate with the database through CLI and it uses all the features implemented for the Twitter system designed.

By using this project a user can follow actions:

• A new user can register in the system and create an account.

• A user who has an account can log in.

• Each system user can send a new tweet.

• Each user can view the tweets he/she has already sent.

• A user can follow/unfollow another user.

• A user can block/unblock another user.

• Every user of the system can receive tweets sent by the people who follow them.

• Each user of the system can receive tweets from another specific user.

• Each user of the system can comment on the tweets of other users who have not blocked him/her.

• Each user of the system can receive comments on a tweet.

• This system also supports hashtags and a user can receive tweets of a hashtag.

• Each system user can like a specific tweet.

• Each user of the system can receive a list of people who liked a particular tweet.

• A user can fetch famous tweets.

• Each user of the system can send a message to another user and each message is either textual content or a tweet.

• Each user of the system can receive a list of messages sent to him/her by a particular user.

• Each user of the system can receive a list of people who have already sent him/her a valid message.