/*
-- create
CREATE TABLE EMPLOYEE (
empId INTEGER PRIMARY KEY,
name TEXT NOT NULL,
dept TEXT NOT NULL
);
-- insert
INSERT INTO EMPLOYEE VALUES (0001, 'Clark', 'Sales');
INSERT INTO EMPLOYEE VALUES (0002, 'Dave', 'Accounting');
INSERT INTO EMPLOYEE VALUES (0003, 'Ava', 'Sales');
-- fetch
SELECT * FROM EMPLOYEE WHERE dept = 'Sales';
*/
CREATE TABLE users(
user_id SERIAL PRIMARY KEY,
user_first_name VARCHAR(30),
user_last_name VARCHAR(30),
user_email_id VARCHAR(50),
user_gender VARCHAR(1),
user_unique_id VARCHAR(15),
user_phone_no VARCHAR(20),
user_dob DATE,
created_ts TIMESTAMP
);
insert into users (
user_first_name, user_last_name, user_email_id, user_gender,
user_unique_id, user_phone_no, user_dob, created_ts
) VALUES
('Giuseppe', 'Bode', '[email protected]', 'M', '88833-8759',
'+86 (764) 443-1967', '1973-05-31', '2018-04-15 12:13:38'),
('Lexy', 'Gisbey', '[email protected]', 'F', '262501-029',
'+86 (751) 160-3742', '2003-05-31', '2020-12-29 06:44:09'),
('Karel', 'Claringbold', '[email protected]', 'F', '391-33-2823',
'+62 (445) 471-2682', '1985-11-28', '2018-11-19 00:04:08'),
('Marv', 'Tanswill', '[email protected]', 'F', '1195413-80',
'+62 (497) 736-6802', '1998-05-24', '2018-11-19 16:29:43'),
('Gertie', 'Espinoza', '[email protected]', 'M', '471-24-6869',
'+249 (687) 506-2960', '1997-10-30', '2020-01-25 21:31:10'),
('Saleem', 'Danneil', '[email protected]', 'F', '192374-933',
'+63 (810) 321-0331', '1992-03-08', '2020-11-07 19:01:14'),
('Rickert', 'O''Shiels', '[email protected]', 'M', '749-27-47-52',
'+86 (184) 759-3933', '1972-11-01', '2018-03-20 10:53:24'),
('Cybil', 'Lissimore', '[email protected]', 'M', '461-75-4198',
'+54 (613) 939-6976', '1978-03-03', '2019-12-09 14:08:30'),
('Melita', 'Rimington', '[email protected]', 'F', '892-36-676-2',
'+48 (322) 829-8638', '1995-12-15', '2018-04-03 04:21:33'),
('Benetta', 'Nana', '[email protected]', 'M', '197-54-1646',
'+420 (934) 611-0020', '1971-12-07', '2018-10-17 21:02:51'),
('Gregorius', 'Gullane', '[email protected]', 'F', '232-55-52-58',
'+62 (780) 859-1578', '1973-09-18', '2020-01-14 23:38:53'),
('Una', 'Glayzer', '[email protected]', 'M', '898-84-336-6',
'+380 (840) 437-3981', '1983-05-26', '2019-09-17 03:24:21'),
('Jamie', 'Vosper', '[email protected]', 'M', '247-95-68-44',
'+81 (205) 723-1942', '1972-03-18', '2020-07-23 16:39:33'),
('Calley', 'Tilson', '[email protected]', 'F', '415-48-894-3',
'+229 (698) 777-4904', '1987-06-12', '2020-06-05 12:10:50'),
('Peadar', 'Gregorowicz', '[email protected]', 'M', '403-39-5-869',
'+7 (267) 853-3262', '1996-09-21', '2018-05-29 23:51:31'),
('Jeanie', 'Webling', '[email protected]', 'F', '399-83-05-03',
'+351 (684) 413-0550', '1994-12-27', '2018-02-09 01:31:11'),
('Yankee', 'Jelf', '[email protected]', 'F', '607-99-0411',
'+1 (864) 112-7432', '1988-11-13', '2019-09-16 16:09:12'),
('Blair', 'Aumerle', '[email protected]', 'F', '430-01-578-5',
'+7 (393) 232-1860', '1979-11-09', '2018-10-28 19:25:35'),
('Pavlov', 'Steljes', '[email protected]', 'F', '571-09-6181',
'+598 (877) 881-3236', '1991-06-24', '2020-09-18 05:34:31'),
('Darn', 'Hadeke', '[email protected]', 'M', '478-32-02-87',
'+370 (347) 110-4270', '1984-09-04', '2018-02-10 12:56:00'),
('Wendell', 'Spanton', '[email protected]', 'F', null,
'+84 (301) 762-1316', '1973-07-24', '2018-01-30 01:20:11'),
('Carlo', 'Yearby', '[email protected]', 'F', null,
'+55 (288) 623-4067', '1974-11-11', '2018-06-24 03:18:40'),
('Sheila', 'Evitts', '[email protected]', null, '830-40-5287',
null, '1977-03-01', '2020-07-20 09:59:41'),
('Sianna', 'Lowdham', '[email protected]', null, '778-0845',
null, '1985-12-23', '2018-06-29 02:42:49'),
('Phylys', 'Aslie', '[email protected]', 'M', '368-44-4478',
'+86 (765) 152-8654', '1984-03-22', '2019-10-01 01:34:28');
SELECT DISTINCT
to_char(created_ts, 'yyyy') AS created_year,
count(*) as user_count
FROM users
GROUP BY created_year
ORDER BY created_year;
SELECT user_id, user_email_id,user_dob,
to_char(user_dob,'Day') as user_day_of_birth
FROM users
WHERE extract(month FROM user_dob)=05
ORDER BY extract(day FROM user_dob);
SELECT user_id, upper(concat(user_first_name, user_last_name)) AS user_name,user_email_id,created_ts,
to_char(created_ts,'yyyy') AS created_year
FROM users
WHERE extract(year FROM created_ts)=2019
ORDER BY user_name;
SELECT DISTINCT user_gender , count(user_id) as user_count
FROM users;
GROUP BY user_gender;
ORDER BY user_count DESC;
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.
PostgreSQL is a open source relational database system and is also knows as Postgres.
CREATE command is used to create a table, schema or an index.
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
....);
ALTER command is used to add, modify or delete columns or constraints from the database table.
ALTER TABLE Table_name ADD column_name datatype;
TRUNCATE command is used to delete the data present in the table but this will not delete the table.
TRUNCATE table table_name;
DROP command is used to delete the table along with its data.
DROP TABLE table_name;
RENAME command is used to rename the table name.
ALTER TABLE table_name1 RENAME to new_table_name1;
INSERT Statement is used to insert new records into the database table.
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
Select statement is used to select data from database tables.
SELECT column1, column2, ...
FROM table_name;
UPDATE statement is used to modify the existing values of records present in the database table.
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
DELETE statement is used to delete the existing records present in the database table.
DELETE FROM table_name where condition;