https://stackoverflow.com › questions › 12597465

With Postgres 9.6 this can be done using the option if not exists. ALTER TABLE table_name ADD COLUMN IF NOT EXISTS column_name INTEGER;

https://docs.postgresql.fr › current › sql-altertable.html

ADD COLUMN [ IF NOT EXISTS ] # Ajoute une nouvelle colonne à la table en utilisant une syntaxe identique à celle de CREATE TABLE. Si IF NOT EXISTS est précisée et qu'une colonne existe déjà avec ce nom, aucune erreur n'est renvoyée. DROP COLUMN [ IF EXISTS ] # Supprime une colonne de la table.

https://www.postgresql.org › docs › current › sql-altertable.htm

ADD COLUMN [ IF NOT EXISTS ] # This form adds a new column to the table, using the same syntax as CREATE TABLE. If IF NOT EXISTS is specified and a column already exists with this name, no error is thrown. DROP COLUMN [ IF EXISTS ] # This form drops a column from a table.

https://collectingwisdom.com › postgresql-add-column-if-not-exists

You can use the ALTER statement with the following syntax to do so: ALTER TABLE athletes ADD COLUMN IF NOT EXISTS rebounds INTEGER; This particular example adds a new column named rebounds with a data type of INTEGER to the table named athletes only if this column does not already exist.

https://hatchjs.com › postgresql-add-column-if-not-exists

In this article, we will show you how to add a column to a table in PostgreSQL if it doesn’t already exist. We will start by creating a simple table called `users` with two columns: `id` and `name`. Then, we will show you how to add a new column called `email` to the table using the `IF NOT EXISTS` clause.

https://www.postgresqltutorial.com › postgresql-tutorial › postgresql-add-column

This tutorial shows you how to use the PostgreSQL ADD COLUMN statement to add one or more columns to an existing database table.

https://hatchjs.com › add-column-if-not-exists-postgres

To add a column if it doesn’t exist in PostgreSQL, you can use the following syntax: sql. ALTER TABLE table_name ADD COLUMN column_name type [IF NOT EXISTS]; For example, the following statement will add a column named `”new_column”` to the `”my_table”` table if the column does not already exist: sql.

https://www.slingacademy.com › article › postgresql-upsert-update-if-exists-insert-if-not

The upsert command in PostgreSQL is a powerful feature allowing you to easily manage data by either updating existing rows if they match on unique constraint or inserting new ones if no match is found. This tutorial will guide you through using PostgreSQL’s upsert feature with comprehensive examples. Mastering Upserts in PostgreSQL.

https://dba.stackexchange.com › questions › 245998

You can use INFORMATION_SCHEMA.COLUMNS to check if the column exists or not. CREATE TABLE t(rid int, foo int); INSERT INTO t VALUES (1,1),(2,2),(3,3); CREATE FUNCTION fnn(id int, new_val int) RETURNS void AS $$ BEGIN IF NOT EXISTS(SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 't' AND COLUMN_NAME = 'bar') THEN ALTER ...

https://dba.stackexchange.com › questions › 132029

ALTER TABLE message ADD COLUMN sender INT REFERENCES users; -- or REFERENCES table(unique_column) Will work fine. You can see the syntax of ALTER TABLE here, ALTER TABLE [ IF EXISTS ] [ ONLY ] name [ * ] action [, ... ] With "action" as, ADD [ COLUMN ] [ IF NOT EXISTS ] column_name data_type [ COLLATE collation ] [ column_constraint