Week10

.vscode/settings.json

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+{
+    "sqltools.connections": [
+        {
+            "previewLimit": 50,
+            "server": "localhost",
+            "port": 5432,
+            "driver": "PostgreSQL",
+            "name": "PG",
+            "database": "postgres",
+            "username": "postgres",
+            "password": "postgres"
+        }
+    ]
+}

DB.py

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+import psycopg2
+
+conn=psycopg2.connect(host="localhost",dbname="postgres",user="postgres",
+                       password="postgres",port="5432")
+cur=conn.cursor()
+cur.execute("""create table if not exists employees(
+    emp_id integer primary key,
+    first_name varchar(100),
+    last_name varchar(100),
+    salary  numeric(10,2),
+    job_title varchar(100),
+    gender varchar(10),
+    hire_date date
+);
+""")
+
+cur.execute("""create table if not exists departments(
+    emp_id integer references employees(emp_id),
+    department_name varchar(100),
+    dep_id integer );""")
+cur.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'),
+            (71119, 'John', 'Doe', 60000, 'Admin Assistant', 'Male', '2019-07-15'),
+            (49823, 'AnyName', 'AnyLast', 70000, 'IT Officer', 'Male', '2019-03-01'),
+    (76589, 'Jason', 'Christian', 99000, 'Project Manager', 'Male', '2019-01-21'),
+    (97927, 'Billie', 'Lanning', 67000, 'Web Developer', 'Female', '2018-06-25');""")
+
+cur.execute("""
+INSERT INTO departments(emp_id, department_name, dep_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);
+""")
+
+conn.commit()
+cur.close()
+conn.close()

PG.session.sql

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+-- Q1 - 
+select *
+from employees
+where salary > (
+        select salary
+        from employees
+        where last_name = 'Weaver'
+            and first_name = 'Rodney'
+    );
+--Q2 -
+select max(salary) as Max_salary,
+    min(salary) as Min_salary,
+    avg(salary) as avg_salary
+from employees --Q3-
+select first_name,
+    last_name,
+    salary
+from employees
+where salary > 87000;
+--Q4-
+select first_name,
+    last_name
+from employees e,
+    departments d
+where e.emp_id = d.emp_id
+    and d.department_name = 'Operations';
+--Q5-
+select first_name,
+    last_name
+from employees e,
+    departments d
+where e.emp_id = d.emp_id
+    and d.department_name = 'Technology';
+--Q6-
+select avg(salary) as avg_salary_female
+from employees
+where gender = 'Female';
+--Q7-
+select avg(salary) as avg_salary , department_name  from employees e, departments d 
+where e.emp_id=d.emp_id
+
+GROUP BY department_name
+َ--َ8-
+select max(hire_date) as newest_date
+, min(hire_date) as oldest_date from employees
+--Q9-
+select hire_date,department_name from employees e ,departments d 
+where e.emp_id=d.emp_id and salary=(select max(salary) from employees)
+
+--Q10-
+select hire_date,department_name from employees e ,departments d 
+where e.emp_id=d.emp_id and salary=(select min(salary) from employees)