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PostgreSQL - Drop table if exists
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In this article, we would like to show you how to DROP TABLE IF EXISTS
in PostgreSQL.
Quick solution:
DROP TABLE IF EXISTS "table_name";
Practical example
To show how the DROP TABLE IF EXISTS
statement works, we will use the following table:
![PostgreSQL - example data used with DROP TABLE statement](https://dirask.com/static/bucket/1617738354447-Jk7ANpVY90--image.png)
Note:
At the end of this article you can find database preparation SQL queries.
Example
In this example, we will delete the users
table.
Query:
DROP TABLE IF EXISTS "users";
Output:
![PostgreSQL - DROP TABLE IF EXISTS result in HeidiSQL (before)](/static/bucket/1617824949261-mJdQ4gjA24--image.png)
![PostgreSQL - DROP TABLE IF EXISTS result in HeidiSQL (after)](/static/bucket/1617824991386-eZ4Q3qZDwy--image.png)
Database preparation
create_tables.sql
file:
CREATE TABLE "users" (
"id" SERIAL,
"name" VARCHAR(50) NOT NULL,
"surname" VARCHAR(50) NOT NULL,
"department_id" INTEGER,
"salary" DECIMAL(15,2) NOT NULL,
PRIMARY KEY ("id")
);
insert_data.sql
file:
INSERT INTO "users"
( "name", "surname", "department_id", "salary")
VALUES
('John', 'Stewart', 1, '3512.00'),
('Chris', 'Brown', 2, '1344.00'),
('Kate', 'Lewis', 3, '6574.00'),
('Ailisa', 'Gomez', NULL, '6500.00'),
('Gwendolyn', 'James', 2, '4200.00'),
('Simon', 'Collins', 4, '3320.00'),
('Taylor', 'Martin', 2, '1500.00'),
('Andrew', 'Thompson', NULL, '2100.00');