SQL-Labs/cities8.sql at main · ySavushkin/SQL-Labs · GitHub

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CREATE TABLE IF NOT EXISTS users (
    id INT PRIMARY KEY,
    username VARCHAR(255) NOT NULL
);

CREATE TABLE IF NOT EXISTS projects (
    id INT PRIMARY KEY,
    name VARCHAR(255) NOT NULL
);

CREATE TABLE IF NOT EXISTS project_members (
    project_id INT,
    user_id INT,
    PRIMARY KEY (project_id, user_id),
    FOREIGN KEY (project_id) REFERENCES projects(id),
    FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS tasks (
    id INT PRIMARY KEY,
    project_id INT,
    author_id INT,
    title VARCHAR(255) NOT NULL,
    description TEXT NOT NULL,
    FOREIGN KEY (project_id) REFERENCES projects(id),
    FOREIGN KEY (author_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS task_assignees (
    task_id INT,
    user_id INT,
    PRIMARY KEY (task_id, user_id),
    FOREIGN KEY (task_id) REFERENCES tasks(id),
    FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE IF NOT EXISTS project_files (
    id INT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    url VARCHAR(255) NOT NULL,
    project_id INT,
    FOREIGN KEY (project_id) REFERENCES projects(id)
);

CREATE TABLE IF NOT EXISTS task_files (
    id INT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    url VARCHAR(255) NOT NULL,
    task_id INT,
    FOREIGN KEY (task_id) REFERENCES tasks(id)
);