In this post, I am sharing a simple example of UPDATE JOIN statement in PostgreSQL.

Many of the database developers are exploring the PostgreSQL so UPDATE a table from another table which is a very common requirement so I am sharing a simple example.

PostgreSQL: Update the Table data using Subquery

Create two sample tables with data:

CREATE TABLE ABC (ID INT, Name CHARACTER VARYING);
CREATE TABLE XYZ (ID INT, Name CHARACTER VARYING);

INSERT INTO ABC VALUES (1,'aaa'),(2,'bbb'),(3,'ccc');
INSERT INTO XYZ VALUES (1,'zzz'),(2,'yyy'),(3,'xxx');

UPDATE JOIN Statement:

UPDATE XYZ
SET Name = ABC.Name
FROM ABC
WHERE XYZ.ID = ABC.ID;

Check the result:

SELECT *FROM XYZ;

id   |  name
----------------------
1    |  aaa
2    |  bbb
3    |  ccc