--create
CREATE TABLE public.employees (employee_id smallint NOT NULL,    last_name character varying(20) NOT NULL,
first_name character varying(10) NOT NULL, 
title character varying(30),   
title_of_courtesy character varying(25),   
birth_date date,    hire_date date,   
address character varying(60),   
city character varying(15),    
region character varying(15),   
postal_code character varying(10),    
country character varying(15),    
home_phone character varying(24),    
extension character varying(4),    
photo bytea,    notes text,   
reports_to smallint,  
photo_path character varying(255));  

--insert

INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (1, 'Davolio', 'Nancy', 'Sales Representative', 'Ms.', '1948-12-08', '1992-05-01', '507 - 20th Ave. E.\nApt. 2A', 'Seattle', 'WA', '98122', 'USA', '(206) 555-9857', '5467', '\x', 'Education includes a BA in psychology from Colorado State University in 1970.  She also completed The Art of the Cold Call.  Nancy is a member of Toastmasters International.', 2, 'http://accweb/emmployees/davolio.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (2, 'Fuller', 'Andrew', 'Vice President, Sales', 'Dr.', '1952-02-19', '1992-08-14', '908 W. Capital Way', 'Tacoma', 'WA', '98401', 'USA', '(206) 555-9482', '3457', '\x', 'Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981.  He is fluent in French and Italian and reads German.  He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993.  Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.', NULL, 'http://accweb/emmployees/fuller.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (3, 'Leverling', 'Janet', 'Sales Representative', 'Ms.', '1963-08-30', '1992-04-01', '722 Moss Bay Blvd.', 'Kirkland', 'WA', '98033', 'USA', '(206) 555-3412', '3355', '\x', 'Janet has a BS degree in chemistry from Boston College (1984).  She has also completed a certificate program in food retailing management.  Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.', 2, 'http://accweb/emmployees/leverling.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (4, 'Peacock', 'Margaret', 'Sales Representative', 'Mrs.', '1937-09-19', '1993-05-03', '4110 Old Redmond Rd.', 'Redmond', 'WA', '98052', 'USA', '(206) 555-8122', '5176', '\x', 'Margaret holds a BA in English literature from Concordia College (1958) and an MA from the American Institute of Culinary Arts (1966).  She was assigned to the London office temporarily from July through November 1992.', 2, 'http://accweb/emmployees/peacock.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (5, 'Buchanan', 'Steven', 'Sales Manager', 'Mr.', '1955-03-04', '1993-10-17', '14 Garrett Hill', 'London', NULL, 'SW1 8JR', 'UK', '(71) 555-4848', '3453', '\x', 'Steven Buchanan graduated from St. Andrews University, Scotland, with a BSC degree in 1976.  Upon joining the company as a sales representative in 1992, he spent 6 months in an orientation program at the Seattle office and then returned to his permanent post in London.  He was promoted to sales manager in March 1993.  Mr. Buchanan has completed the courses Successful Telemarketing and International Sales Management.  He is fluent in French.', 2, 'http://accweb/emmployees/buchanan.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (6, 'Suyama', 'Michael', 'Sales Representative', 'Mr.', '1963-07-02', '1993-10-17', 'Coventry House\nMiner Rd.', 'London', NULL, 'EC2 7JR', 'UK', '(71) 555-7773', '428', '\x', 'Michael is a graduate of Sussex University (MA, economics, 1983) and the University of California at Los Angeles (MBA, marketing, 1986).  He has also taken the courses Multi-Cultural Selling and Time Management for the Sales Professional.  He is fluent in Japanese and can read and write French, Portuguese, and Spanish.', 5, 'http://accweb/emmployees/davolio.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (7, 'King', 'Robert', 'Sales Representative', 'Mr.', '1960-05-29', '1994-01-02', 'Edgeham Hollow\nWinchester Way', 'London', NULL, 'RG1 9SP', 'UK', '(71) 555-5598', '465', '\x', 'Robert King served in the Peace Corps and traveled extensively before completing his degree in English at the University of Michigan in 1992, the year he joined the company.  After completing a course entitled Selling in Europe, he was transferred to the London office in March 1993.', 5, 'http://accweb/emmployees/davolio.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (8, 'Callahan', 'Laura', 'Inside Sales Coordinator', 'Ms.', '1958-01-09', '1994-03-05', '4726 - 11th Ave. N.E.', 'Seattle', 'WA', '98105', 'USA', '(206) 555-1189', '2344', '\x', 'Laura received a BA in psychology from the University of Washington.  She has also completed a course in business French.  She reads and writes French.', 2, 'http://accweb/emmployees/davolio.bmp');INSERT INTO public.employees (employee_id, last_name, first_name, title, title_of_courtesy, birth_date, hire_date, address, city, region, postal_code, country, home_phone, extension, photo, notes, reports_to, photo_path) VALUES (9, 'Dodsworth', 'Anne', 'Sales Representative', 'Ms.', '1966-01-27', '1994-11-15', '7 Houndstooth Rd.', 'London', NULL, 'WG2 7LT', 'UK', '(71) 555-4444', '452', '\x', 'Anne has a BA degree in English from St. Lawrence College.  She is fluent in French and German.', 5, 'http://accweb/emmployees/davolio.bmp');
--fetch
SELECT * FROM public.employees;

PostgreSQL online editor

Write, Run & Share PostgreSQL queries online using OneCompiler's PostgreSQL online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for PostgreSQL. Getting started with the OneCompiler's PostgreSQL editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose database as 'PostgreSQL' and start writing queries to learn and test online without worrying about tedious process of installation.

About PostgreSQL

PostgreSQL is a open source relational database system and is also knows as Postgres.

Key Features:

  • Postgres is not only free and open-source but also it is highly extensible.
  • Custom Data types and funtions from various programming languaues can be introduced and the good part is compiling entire database is not required.
  • ACID(Atomicity, Consistency, Isolation, Durability) compliant.
  • First DBMS which implemented Multi-version concurrency control (MVCC) feature.
  • It's the default database server for MacOS.
  • It supports all major operating systems like Linux, Windows, OpenBSD,FreeBSD etc.

Syntax help

1. CREATE

CREATE command is used to create a table, schema or an index.

Syntax:

         CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

2. ALTER

ALTER command is used to add, modify or delete columns or constraints from the database table.

Syntax

ALTER TABLE Table_name ADD column_name datatype;

3. TRUNCATE:

TRUNCATE command is used to delete the data present in the table but this will not delete the table.

Syntax

TRUNCATE table table_name;

4. DROP

DROP command is used to delete the table along with its data.

Syntax

DROP TABLE table_name;

5. RENAME

RENAME command is used to rename the table name.

Syntax

ALTER TABLE table_name1 RENAME to new_table_name1;

6. INSERT

INSERT Statement is used to insert new records into the database table.

Syntax

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

7. SELECT

Select statement is used to select data from database tables.

Syntax:

SELECT column1, column2, ...
FROM table_name;

8. UPDATE

UPDATE statement is used to modify the existing values of records present in the database table.

Syntax

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

9. DELETE

DELETE statement is used to delete the existing records present in the database table.

Syntax

DELETE FROM table_name where condition;