PostgreSQL Merge Into

Source: Dev.to

SQL Update Statement

UPDATE PSMT_INVOICE_M
SET    SHIPPING_COUNTRY_ID = SRC.COUNTRY_ID,
       SHIPPING_CITY_ID    = SRC.CITY_ID,
       SHIPPING_TOWN_ID    = SRC.TOWN_ID
FROM   (
    SELECT
        PM.INVOICE_M_ID,
        FE.COUNTRY_ID,
        FE.CITY_ID,
        FE.TOWN_ID
    FROM PSMT_INVOICE_M PM
    JOIN FIND_ENTITY FE ON PM.ENTITY_ID = FE.ENTITY_ID
) SRC
WHERE  PSMT_INVOICE_M.INVOICE_M_ID = SRC.INVOICE_M_ID;