Question

In one db i have table PRODUCTS with columns NAME and TECHNICAL_NAME.

In second database I have table TEMP_PRODUCTS with columns NAME (that corresponds to column NAME of the table PRODUCTS from the 1st db) and TECHNICAL_NAME that is null and that should be updated with the corresponding TECHNICAL_NAME values from 1st db.

So I should do UPDATE table TEMP_PRODUCTS by using JOIN with columns NAME?

I would like to avoid solution with exporting table from 1st bd and importing it to the 2nd db.

How can I do this?

Answer 1

By Creating the DB Link only we can access the one DB objects from another DB.

CREATE DATABASE LINK db1_link 
   CONNECT TO <User Name> IDENTIFIED BY <pwd>
   USING 'db2'; 

— db2 means Service Name for exp products db

Then Update Statement

UPDATE temp_products tp
  SET technical_name=
    (SELECT technical_name FROM products@db1_link p
      WHERE tp.name = p.name)