team1_ DB_week10

Team1/Haluk/README.md

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+# Database_Modul_Week_10
+
+## TASK_1
+
+- Additional Source: https://www.youtube.com/watch?v=miEFm1CyjfM&t=314s (in English)
+* Before doing your Github homework, let's create the following tables in PostgreSQL using Python codes. Let's write the codes to run the queries.
+
+![image](https://github.com/user-attachments/assets/a56283aa-2e46-4cb0-86ec-eeb7837ed520)
+
+
+![image](https://github.com/user-attachments/assets/e5be4d85-0781-48aa-b640-1b559be37de4)
+
+
+1. Find the employees who get paid more than Rodney Weaver.
+2. Find the average, min and max salaries
+3. Find the employees whose salary is more than 8700. Our query should return first name, last name, and salary info of the employees.
+4. Find the employees (first name, last name from employees table) who work under the Operations department (departments table). Our query should return first name and last name info.
+5. Find the employees (first name, last name from employees table) who work under the Technology department (departments table). Our query should return first name and last name info.
+6. Find the average salary of female employees. 
+7. Find the average salaries of each department.
+8. Find the oldest and newest employees. 
+9. Find the hiring date and department of the highest paid employee
+10. Find the hiring date and department of the lowest paid employee
+
+## TASK_2
+
+You are expected to complete the mini project, which has a detailed explanation in the link below.
+
+https://werhere-it-academy.gitbook.io/werhere-it-academy-handbook/database-modulu/3.hafta/database-project-vit4
+
+
+### GoodLuck :)

Team1/Haluk/homework.py

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+import psycopg2
+
+conn = psycopg2.connect(host='localhost',dbname='postgres',user='postgres',password='344230haluk',port=5432)
+
+cur = conn.cursor()
+
+# DEPARTMENTS_TABLE
+
+cur.execute("""CREATE TABLE IF NOT EXISTS departments_table( 
+    emp_id INT PRIMARY KEY,
+    dept_name VARCHAR(100),
+    dept_id INT
+);
+""")
+
+cur.execute("""INSERT INTO departments_table (emp_id,dept_name,dept_id) VALUES
+(17679, 'Operations', 13),
+(26650, 'Marketing', 14),
+(30840, 'Operations', 13),
+(49823, 'Technology', 12),
+(51821, 'Operations', 13),
+(67323, 'Marketing', 14),
+(71119, 'Administrative', 11),
+(76589, 'Operations', 13),
+(97927, 'Technology', 12)
+ON CONFLICT (emp_id) DO NOTHING;
+""")
+
+
+
+
+
+
+
+# EMPLOYEES_TABLE OLUSTURULAN YER
+cur.execute("""CREATE TABLE IF NOT EXISTS employees_table( 
+    emp_id INT PRIMARY KEY,
+    firs_name VARCHAR(100),
+    last_name VARCHAR(100),
+    salary INT,
+    job_title VARCHAR(200),
+    gender VARCHAR(20),
+    hire_date DATE
+);
+""")
+
+cur.execute("""INSERT INTO employees_table (emp_id,firs_name,last_name,salary,job_title,gender,hire_date) VALUES
+(17679, 'Robert', 'Gilmore', 110000, 'Operations Director', 'Male', '2018-09-04'),
+(26650, 'Elvis', 'Ritter', 86000, 'Sales Manager', 'Male', '2017-11-24'),
+(30840, 'David', 'Barrow', 85000, 'Data Scientist', 'Male', '2019-12-02'),
+(49714, 'Hugo', 'Forester', 55000, 'IT Support Specialist', 'Male', '2019-11-22'),
+(51821, 'Linda', 'Foster', 95000, 'Data Scientist', 'Female', '2019-04-29'),
+(67323, 'Lisa', 'Wiener', 75000, 'Business Analyst', 'Female', '2018-08-09'),
+(70950, 'Rodney', 'Weaver', 87000, 'Project Manager', 'Male', '2018-12-20'),
+(71329, 'Gayle', 'Meyer', 77000, 'HR Manager', 'Female', '2019-06-28'),
+(76589, 'Jason', 'Christian', 99000, 'Project Manager', 'Male', '2019-01-21'),
+(97927, 'Billie', 'Lanning', 67000, 'Web Developer', 'Female', '2018-06-25')
+ON CONFLICT (emp_id) DO NOTHING;
+""")
+
+
+conn.commit()
+cur.close()
+conn.close()

Team1/Islam/Homework.py

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+import psycopg2
+
+# 1. Önce 'postgres' veritabanına bağlan ve yeni veritabanını oluştur
+baglan = psycopg2.connect(
+    dbname='postgres',
+    user='postgres',
+    password='411.Falcon',
+    host='localhost',
+    port='5432'
+)
+
+baglan.autocommit = True  # CREATE DATABASE için autocommit açık olmalı
+cursor = baglan.cursor()
+
+# 'odev' veritabanı varsa oluşturma
+cursor.execute("SELECT 1 FROM pg_database WHERE datname = 'odev';")
+db_var_mi = cursor.fetchone()
+
+if not db_var_mi:
+    cursor.execute("CREATE DATABASE odev;")
+else:
+    print("Veritabanı zaten var, oluşturulmadı.")
+
+#1️⃣ pg_database, sistemdeki tüm veritabanlarının kayıtlı olduğu bir tablodur.
+#2️⃣ datname = 'odev', bu tablo içinde "odev" adında bir veritabanı olup olmadığını kontrol eder.
+#3️⃣ SELECT 1, sadece "odev" varsa 1 döndürmesini sağlar (gereksiz veri çekmemek için).
+
+#📌 Eğer "odev" veritabanı varsa, sonuç olarak 1 döner.
+#📌 Eğer yoksa, sonuç boş (None) olur.
+
+
+cursor.close()
+baglan.close()
+
+# 2. Yeni oluşturduğun 'odev' veritabanına bağlan
+baglan = psycopg2.connect(
+    dbname='odev',
+    user='postgres',
+    password='411.Falcon',
+    host='localhost',
+    port='5432'
+)
+
+cursor = baglan.cursor()
+
+# 3. 'employees' tablosunu oluştur
+cursor.execute("""
+    CREATE TABLE IF NOT EXISTS employees (
+        emp_id SERIAL PRIMARY KEY,
+        first_name VARCHAR(100), 
+        last_name VARCHAR(100),
+        salary INT,
+        job_title VARCHAR(200),
+        gender VARCHAR(20),
+        hire_date DATE       
+    );               
+""")
+
+
+cursor.execute("""
+    INSERT INTO employees (emp_id,first_name,last_name,salary,job_title,gender,hire_date) VALUES
+        (17679, 'Robert', 'Gilmore', 110000, 'Operations Director', 'Male', '2018-09-04'),
+        (26650, 'Elvis', 'Ritter', 86000, 'Sales Manager', 'Male', '2017-11-24'),
+        (30840, 'David', 'Barrow', 85000, 'Data Scientist', 'Male', '2019-12-02'),
+        (49714, 'Hugo', 'Forester', 55000, 'IT Support Specialist', 'Male', '2019-11-22'),
+        (51821, 'Linda', 'Foster', 95000, 'Data Scientist', 'Female', '2019-04-29'),
+        (67323, 'Lisa', 'Wiener', 75000, 'Business Analyst', 'Female', '2018-08-09'),
+        (70950, 'Rodney', 'Weaver', 87000, 'Project Manager', 'Male', '2018-12-20'),
+        (71329, 'Gayle', 'Meyer', 77000, 'HR Manager', 'Female', '2019-06-28'),
+        (76589, 'Jason', 'Christian', 99000, 'Project Manager', 'Male', '2019-01-21'),
+        (97927, 'Billie', 'Lanning', 67000, 'Web Developer', 'Female', '2018-06-25')
+    ON CONFLICT (emp_id) DO NOTHING;
+""")
+
+cursor.execute("""
+    CREATE TABLE IF NOT EXISTS departments_table( 
+        emp_id INT PRIMARY KEY,
+        dept_name VARCHAR(100),
+        dept_id INT
+);
+""")
+
+cursor.execute("""
+    INSERT INTO departments_table (emp_id,dept_name,dept_id) VALUES
+        (17679, 'Operations', 13),
+        (26650, 'Marketing', 14),
+        (30840, 'Operations', 13),
+        (49823, 'Technology', 12),
+        (51821, 'Operations', 13),
+        (67323, 'Marketing', 14),
+        (71119, 'Administrative', 11),
+        (76589, 'Operations', 13),
+        (97927, 'Technology', 12)
+    ON CONFLICT (emp_id) DO NOTHING;
+""")
+# 1- Find the employees who get paid more than Rodney Weaver.
+cursor.execute("""
+    SELECT first_name, last_name, salary
+    FROM employees
+    WHERE salary > 87000;
+""")
+## print(cursor.fetchone())
+
+# 2- Find the average, min and max salaries
+cursor.execute("""
+    SELECT MIN(salary), MAX(salary), AVG(salary)
+    FROM employees;
+""")
+#print(cursor.fetchone())
+
+# 3- Find the employees whose salary is more than 8700.
+#  Our query should return first name, last name, and salary info of the employees.
+cursor.execute("""
+    SELECT first_name, last_name, salary
+    FROM employees
+    WHERE salary > 87000;
+""")
+# print(cursor.fetchone())
+
+# 4- Find the employees (first name, last name from employees table) who work under the Operations department (departments table).
+#  Our query should return first name and last name info.
+cursor.execute("""
+    SELECT first_name, last_name
+    FROM employees
+    INNER JOIN departments_table ON employees.emp_id = departments_table.emp_id
+    WHERE dept_name = 'Operations';
+""")
+#print(cursor.fetchone())
+
+# 5- Find the employees (first name, last name from employees table) who work under the Technology department (departments table).
+#  Our query should return first name and last name info.
+cursor.execute("""
+    SELECT first_name, last_name
+    FROM employees
+    INNER JOIN departments_table ON employees.emp_id = departments_table.emp_id
+    WHERE dept_name = 'Technology';
+""")
+#print(cursor.fetchone())
+
+# 6- Find the average salary of female employees.
+cursor.execute("""
+    SELECT AVG(salary)
+    FROM employees
+    WHERE gender = 'Female';
+""")
+#print(cursor.fetchone())
+
+# 7- Find the average salaries of each department.
+cursor.execute("""
+    SELECT departments_table.dept_name, AVG(salary)
+    FROM employees
+    INNER JOIN departments_table ON employees.emp_id = departments_table.emp_id
+    GROUP BY departments_table.dept_name; 
+""")
+#print(cursor.fetchone())
+
+# 8- Find the oldest and newest employees.
+cursor.execute("""
+SELECT MIN(hire_date) AS oldest_hire, MAX(hire_date) AS newest_hire
+FROM employees;
+""")
+#print(cursor.fetchone())
+
+# 9- Find the hiring date and department of the highest paid employee
+cursor.execute("""
+    SELECT employees.hire_date, departments_table.dept_name
+    FROM employees
+    INNER JOIN departments_table ON employees.emp_id = departments_table.emp_id
+    WHERE employees.salary = (SELECT MAX(salary) FROM employees);
+""")
+# print(cursor.fetchone())
+
+# 10-Find the hiring date and department of the lowest paid employee
+cursor.execute("""
+    SELECT employees.hire_date, departments_table.dept_name
+    FROM employees
+    INNER JOIN departments_table ON employees.emp_id = departments_table.emp_id
+    WHERE employees.salary = (SELECT MIN (salary) FROM employees)
+ """)
+
+
+
+baglan.commit()
+cursor.close()
+baglan.close()

Team1/Islam/README.md

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+# Database_Modul_Week_10
+
+## TASK_1
+
+- Additional Source: https://www.youtube.com/watch?v=miEFm1CyjfM&t=314s (in English)
+* Before doing your Github homework, let's create the following tables in PostgreSQL using Python codes. Let's write the codes to run the queries.
+
+![image](https://github.com/user-attachments/assets/a56283aa-2e46-4cb0-86ec-eeb7837ed520)
+
+
+![image](https://github.com/user-attachments/assets/e5be4d85-0781-48aa-b640-1b559be37de4)
+
+
+1. Find the employees who get paid more than Rodney Weaver.
+2. Find the average, min and max salaries
+3. Find the employees whose salary is more than 8700. Our query should return first name, last name, and salary info of the employees.
+4. Find the employees (first name, last name from employees table) who work under the Operations department (departments table). Our query should return first name and last name info.
+5. Find the employees (first name, last name from employees table) who work under the Technology department (departments table). Our query should return first name and last name info.
+6. Find the average salary of female employees. 
+7. Find the average salaries of each department.
+8. Find the oldest and newest employees. 
+9. Find the hiring date and department of the highest paid employee
+10. Find the hiring date and department of the lowest paid employee
+
+## TASK_2
+
+You are expected to complete the mini project, which has a detailed explanation in the link below.
+
+https://werhere-it-academy.gitbook.io/werhere-it-academy-handbook/database-modulu/3.hafta/database-project-vit4
+
+
+### GoodLuck :)

Team1/Yasın/README.md

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+# Database_Modul_Week_10
+
+## TASK_1
+
+- Additional Source: https://www.youtube.com/watch?v=miEFm1CyjfM&t=314s (in English)
+* Before doing your Github homework, let's create the following tables in PostgreSQL using Python codes. Let's write the codes to run the queries.
+
+![image](https://github.com/user-attachments/assets/a56283aa-2e46-4cb0-86ec-eeb7837ed520)
+
+
+![image](https://github.com/user-attachments/assets/e5be4d85-0781-48aa-b640-1b559be37de4)
+
+
+1. Find the employees who get paid more than Rodney Weaver.
+2. Find the average, min and max salaries
+3. Find the employees whose salary is more than 8700. Our query should return first name, last name, and salary info of the employees.
+4. Find the employees (first name, last name from employees table) who work under the Operations department (departments table). Our query should return first name and last name info.
+5. Find the employees (first name, last name from employees table) who work under the Technology department (departments table). Our query should return first name and last name info.
+6. Find the average salary of female employees. 
+7. Find the average salaries of each department.
+8. Find the oldest and newest employees. 
+9. Find the hiring date and department of the highest paid employee
+10. Find the hiring date and department of the lowest paid employee
+
+## TASK_2
+
+You are expected to complete the mini project, which has a detailed explanation in the link below.
+
+https://werhere-it-academy.gitbook.io/werhere-it-academy-handbook/database-modulu/3.hafta/database-project-vit4
+
+
+### GoodLuck :)