Tanyo Nikolov - Coursework

course-work/Implementations/README.md

@@ -0,0 +1,6 @@
+Фак. номер: 1901322039 
+Име: Таньо Николов
+
+Проектът е за социалната мрежа LinkedIn
+
+Линк към Google Looker Studio (визуализации): https://lookerstudio.google.com/u/1/reporting/d6c9d2a7-3204-4297-8b81-b75feb668f5d/page/vFycF 

course-work/Implementations/functions.sql

@@ -0,0 +1,22 @@
+DELIMITER //
+
+CREATE FUNCTION GetMostLikedComment()
+RETURNS TEXT
+DETERMINISTIC
+READS SQL DATA
+BEGIN
+    DECLARE most_liked_comment INT;
+
+    RETURN (SELECT Content FROM USER_COMMENT ORDER BY Likes LIMIT 1);
+END //
+
+CREATE FUNCTION PostsCount()
+RETURNS INT
+DETERMINISTIC
+READS SQL DATA
+BEGIN
+    RETURN (SELECT COUNT(*) FROM POST);
+END //
+
+-- Usage example
+-- SELECT GetMostLikedComment() as 'Most liked comment';

course-work/Implementations/linkedin-db.sql

@@ -0,0 +1,180 @@
+DROP DATABASE IF EXISTS linkedin;
+
+CREATE DATABASE IF NOT EXISTS linkedin;
+
+USE linkedin;
+
+CREATE TABLE USER (
+    UserID INT AUTO_INCREMENT PRIMARY KEY,
+    Name VARCHAR(100) NOT NULL,
+    Email VARCHAR(150) NOT NULL UNIQUE,
+    Headline VARCHAR(255),
+    Location VARCHAR(100),
+    Summary TEXT,
+    CreatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    UpdatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+);
+
+CREATE TABLE COMPANY (
+    CompanyID INT AUTO_INCREMENT PRIMARY KEY,
+    CompanyName VARCHAR(200) NOT NULL,
+    Website VARCHAR(255),
+    Industry VARCHAR(100),
+    Size VARCHAR(50),
+    CreatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE POST (
+    PostID INT AUTO_INCREMENT PRIMARY KEY,
+    UserID INT NOT NULL,
+    Content TEXT NOT NULL,
+    CreatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    UpdatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, 
+    FOREIGN KEY (UserID) REFERENCES USER(UserID)
+);
+
+CREATE TABLE JOB_POSTING (
+    JobID INT AUTO_INCREMENT PRIMARY KEY,
+    CompanyID INT NOT NULL,
+    Title VARCHAR(200) NOT NULL,
+    Description TEXT,
+    Location VARCHAR(100),
+    Requirements TEXT,
+    PostedDate DATE,
+    ExpiryDate DATE,
+    FOREIGN KEY (CompanyID) REFERENCES COMPANY(CompanyID)
+);
+
+CREATE TABLE MESSAGE (
+    MessageID INT AUTO_INCREMENT PRIMARY KEY,
+    SenderID INT NOT NULL,
+    ReceiverID INT NOT NULL,
+    Content TEXT,
+    Timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (SenderID) REFERENCES USER(UserID),
+    FOREIGN KEY (ReceiverID) REFERENCES USER(UserID)
+);
+
+CREATE TABLE SKILL (
+    SkillID INT AUTO_INCREMENT PRIMARY KEY,
+    SkillName VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE EDUCATION (
+    EducationID INT AUTO_INCREMENT PRIMARY KEY,
+    Degree VARCHAR(100),
+    InstitutionName VARCHAR(200),
+    StartDate DATE,
+    EndDate DATE,
+    Grade VARCHAR(50)
+);
+
+
+CREATE TABLE USER_COMMENT (
+    UserCommentID INT AUTO_INCREMENT PRIMARY KEY,
+    UserID INT NOT NULL,
+    PostID INT NOT NULL,
+    Content TEXT,
+    Likes INT,
+    FOREIGN KEY (PostID) REFERENCES POST(PostID)
+);
+
+
+CREATE TABLE WORK_EXPERIENCE (
+    ExperienceID INT AUTO_INCREMENT PRIMARY KEY,
+    UserID INT NOT NULL,
+    CompanyID INT NOT NULL,
+    JobTitle VARCHAR(150),
+    StartDate DATE,
+    EndDate DATE,
+    Description TEXT,
+    IsCurrent BOOLEAN DEFAULT FALSE,
+    FOREIGN KEY (UserID) REFERENCES USER(UserID),
+    FOREIGN KEY (CompanyID) REFERENCES COMPANY(CompanyID)
+);
+
+CREATE TABLE USER_SKILL (
+    UserSkillID INT AUTO_INCREMENT PRIMARY KEY,
+    UserID INT NOT NULL,
+    SkillID INT NOT NULL,
+    EndorsementCount INT DEFAULT 0,
+    FOREIGN KEY (UserID) REFERENCES USER(UserID),
+    FOREIGN KEY (SkillID) REFERENCES SKILL(SkillID)
+);
+
+CREATE TABLE USER_EDUCATION (
+    UserEducationID INT AUTO_INCREMENT PRIMARY KEY,
+    UserID INT NOT NULL,
+    EducationID INT NOT NULL,
+    StartDate DATE,
+    EndDate DATE,
+    Grade VARCHAR(20),
+    FOREIGN KEY (UserID) REFERENCES USER(UserID),
+    FOREIGN KEY (EducationID) REFERENCES EDUCATION(EducationID)
+);
+
+
+CREATE TABLE POST_REACTION (
+    ReactionID INT AUTO_INCREMENT PRIMARY KEY,
+    UserID INT NOT NULL,
+    PostID INT NOT NULL,
+    ReactionType ENUM('like', 'celebrate', 'love', 'insightful', 'curious'),
+    CreatedAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (UserID) REFERENCES USER(UserID),
+    FOREIGN KEY (PostID) REFERENCES POST(PostID)
+);
+
+
+INSERT INTO USER (Name, Email, Headline, Location, Summary) VALUES
+('Ivan Petrov', '[email protected]', 'Senior Software Engineer', 'Sofia, Bulgaria', 'Experienced full-stack developer specializing in cloud solutions.'),
+('Maria Dimitrova', '[email protected]', 'Product Manager', 'Plovdiv, Bulgaria', 'Leading cross-functional teams to deliver SaaS products.');
+
+INSERT INTO COMPANY (CompanyName, Website, Industry, Size) VALUES
+('Cognify Labs Ltd', 'https://cognifylabs.com', 'Information Technology', '50-200'),
+('TechBridge Solutions', 'https://techbridgesolutions.com', 'Financial Services', '100-500');
+
+INSERT INTO SKILL (SkillName) VALUES
+('AWS Certified Developer'),
+('Project Management'),
+('TypeScript'),
+('React');
+
+INSERT INTO EDUCATION (Degree, InstitutionName, StartDate, EndDate, Grade) VALUES
+('MSc Computer Science', 'Plovdiv University', '2016-09-01', '2018-06-30', 'Excellent'),
+('BA Business Administration', 'Sofia University', '2012-09-01', '2016-06-30', 'Good');
+
+INSERT INTO USER_SKILL (UserID, SkillID, EndorsementCount) VALUES
+(1, 1, 6),
+(1, 3, 12),
+(2, 2, 4),
+(2, 4, 8);
+
+INSERT INTO USER_EDUCATION (UserID, EducationID, StartDate, EndDate, Grade) VALUES
+(1, 1, '2016-09-01', '2018-06-30', 'Excellent'),
+(2, 2, '2012-09-01', '2016-06-30', 'Good');
+
+INSERT INTO POST (UserID, Content) VALUES
+(1, 'Excited to join Cognify Labs and work on cloud-native projects!'),
+(2, 'Thrilled to announce our new B2B platform release!');
+
+
+INSERT INTO MESSAGE (SenderID, ReceiverID, Content) VALUES
+(1, 2, 'Welcome to the team, Maria!'),
+(2, 1, 'Thanks, Ivan! Looking forward to working together.');
+
+INSERT INTO WORK_EXPERIENCE (UserID, CompanyID, JobTitle, StartDate, EndDate, IsCurrent) VALUES
+(1, 1, 'Senior Software Engineer', '2019-01-01', NULL, TRUE),
+(2, 2, 'Product Manager', '2022-04-01', NULL, TRUE);
+
+INSERT INTO JOB_POSTING (CompanyID, Title, Description, Location, Requirements, PostedDate, ExpiryDate) VALUES
+(1, 'Full-Stack Developer', 'Join us to build scalable web applications.', 'Remote', 'React, Node.js, AWS', '2025-10-01', '2025-12-31'),
+(2, 'Data Analyst', 'Work with our fintech platform data sets.', 'Plovdiv', 'SQL, Python, Excel', '2025-09-15', '2025-11-30');
+
+INSERT INTO POST_REACTION (UserID, PostID, ReactionType) VALUES
+(2, 1, 'celebrate'),
+(1, 2, 'insightful');
+
+INSERT INTO USER_COMMENT (UserID, PostID, Content, Likes) VALUES
+(1, 2,  "Great product!Will try it myself.", 3),
+(2, 1,  "Congrats on your new role!!!", 1);
+