EN
PostgreSQL - Create or replace view
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In this article, we would like to show you how to create and update a view using CREATE OR REPLACE VIEW in PostgreSQL.
Quick solution:
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CREATE OR REPLACE VIEW "view_name" AS2
SELECT "column1", "column2", "columnN"3
FROM "table_name"4
WHERE condition;To show how to create or replace a view, we will use the following table:
Note:
At the end of this article you can find database preparation SQL queries.
In this example, we will create a view using CREATE OR REPLACE VIEW statement.
Query:
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CREATE OR REPLACE VIEW "spain_users" AS2
SELECT *3
FROM "users"4
WHERE "country" = 'Spain';Result:
In this example, we will remove the country column from the view created in Example 1. We will remove the column by updating the existing view using CREATE OR REPLACE VIEW statement.
Query:
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CREATE OR REPLACE VIEW "spain_users" AS2
SELECT "id", "name", "email"3
FROM "users"4
WHERE "country" = 'Spain';Result:
create_tables.sql file:
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CREATE TABLE "users" (2
"id" SERIAL PRIMARY KEY,3
"name" VARCHAR(100) NOT NULL,4
"email" VARCHAR(100) NOT NULL,5
"country" VARCHAR(15) NOT NULL6
);insert_data.sql file:
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INSERT INTO "users"2
("name", "email", "country")3
VALUES4
('Tom', 'tom@email.com', 'Poland'),5
('Chris','chris@email.com', 'Spain'),6
('Jack','jack@email.com', 'Spain'),7
('Kim','kim@email.com', 'Vietnam'),8
('Marco','marco@email.com', 'Italy'),9
('Kate','kate@email.com', 'Spain'),10
('Nam','nam@email.com', 'Vietnam');create_view.sql file:
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CREATE VIEW "spain_users" AS2
SELECT *3
FROM "users"4
WHERE "country" = 'Spain';