Added postgresql sql tasks.
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CREATE TABLE regions (
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  region_id INTEGER PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
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  region_name VARCHAR(30)
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);
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INSERT INTO regions
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  (region_id, region_name)
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VALUES
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  (1,'Europe'),
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  (2,'Americas'),
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  (3,'Asia'),
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  (4,'Middle East and Africa');
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SELECT setval('regions_region_id_seq', 4, true);
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CREATE TABLE countries (
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  country_id CHAR(2) PRIMARY KEY,
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  country_name VARCHAR(45),
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  region_id INTEGER NOT NULL REFERENCES regions (region_id)
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);
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INSERT INTO countries(country_id,country_name,region_id) VALUES
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  ('AR','Argentina',2),
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  ('AU','Australia',3),
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  ('BE','Belgium',1),
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  ('BR','Brazil',2),
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  ('CA','Canada',2),
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  ('CH','Switzerland',1),
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  ('CN','China',3),
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  ('DE','Germany',1),
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  ('DK','Denmark',1),
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  ('EG','Egypt',4),
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  ('FR','France',1),
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  ('HK','HongKong',3),
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  ('IL','Israel',4),
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  ('IN','India',3),
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  ('IT','Italy',1),
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  ('JP','Japan',3),
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  ('KW','Kuwait',4),
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  ('MX','Mexico',2),
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  ('NG','Nigeria',4),
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  ('NL','Netherlands',1),
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  ('SG','Singapore',3),
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  ('UK','United Kingdom',1),
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  ('US','United States of America',2),
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  ('ZM','Zambia',4),
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  ('ZW','Zimbabwe',4);
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CREATE TABLE locations (
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  location_id INTEGER PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
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  street_address VARCHAR(45),
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  postal_code VARCHAR(12),
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  city VARCHAR (30) NOT NULL,
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  state_province VARCHAR (25),
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  country_id CHAR(2) NOT NULL REFERENCES countries (country_id)
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);
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INSERT INTO locations
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  (location_id,street_address,postal_code,city,state_province,country_id)
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VALUES
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  (1,'9122 Rockfeller Rd','34232','Effingham','Indiana','US'),
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  (2,'44 Isaac Newton Ave','54898','London','London','UK'),
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  (3,'Deutschland 3232','79822','Munich','Bavaria','DE'),
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  (4,'210 W Main St','84032','Lehi','Utah','US');
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SELECT setval('locations_location_id_seq', 4, true);
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CREATE TABLE departments (
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  department_id INTEGER PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
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  department_name VARCHAR (30) NOT NULL,
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  location_id INTEGER REFERENCES locations (location_id)
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);
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INSERT INTO departments
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  (department_id, department_name, location_id)
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VALUES
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  (1,'Management', 1),
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  (2,'Information Technology',2),
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  (3,'Human Resources',3),
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  (4,'Sales',1);
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SELECT setval('departments_department_id_seq', 4, true);
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CREATE TABLE employees (
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  employee_id INTEGER PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
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  first_name VARCHAR(20),
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  last_name VARCHAR(25) NOT NULL,
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  start_date DATE NOT NULL DEFAULT CURRENT_DATE,
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  job_title VARCHAR(100) NOT NULL,
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  salary NUMERIC (9, 2) NOT NULL,
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  manager_id INTEGER,
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  department_id INTEGER,
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  FOREIGN KEY (department_id) REFERENCES departments (department_id),
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  FOREIGN KEY (manager_id) REFERENCES employees (employee_id)
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);
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INSERT INTO employees
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  (employee_id, first_name, last_name, start_date, job_title, salary, manager_id, department_id)
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VALUES
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  (1,'John','Smith','1989-05-07','President',364000.00,NULL,1),
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  (2,'Pointy','HairedBoss','1999-08-12','CTO',27000.00,1,2),
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  (3,'Dilbertzoni','DeScrewed','2001-02-02','Software Engineer',77000.00,2,2),
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  (4,'Vanda','Socialist','1994-03-06','VP Equity Diversity Inclusion',90000.00,1,3),
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  (5,'Howard','TheDuck','2001-08-11','VP Sales', 80000.00,1,4),
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  (6,'Luke','Fett','2007-07-21','Sales Guy',68000.00,5,4),
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  (7,'John','SkipWork','2003-05-03','HR Henchman',68000.00,4,3),
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  (8,'Lea','Palpatine','2009-07-04','UI Designer',87000.00,2,2);
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SELECT setval('employees_employee_id_seq', 8, true);
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CREATE TABLE dependents (
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  dependent_id INTEGER PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
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  first_name VARCHAR (50) NOT NULL,
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  last_name VARCHAR (50) NOT NULL,
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  employee_id INTEGER NOT NULL REFERENCES employees (employee_id)
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);
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INSERT INTO dependents
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  (dependent_id, first_name, last_name, employee_id)
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VALUES
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  (1,'Spoiled','Smith',1),
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  (2,'DoNothin','Smith',1),
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  (3,'Rafael','HairedBoss',2),
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  (4,'Beta','HairedBoss',2),
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  (5,'Wanda','DeScrewed',3);
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SELECT setval('dependents_dependent_id_seq', 5, true);
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