Nemyslím si, že můžete napsat příkaz UPDATE v Oracle pomocí JOIN.
UPDATE INSURED_FARMERS I
SET I.CAP_NAME = ( SELECT S.CAP_NAME
FROM INDIAN_STATES_REGION S
WHERE UPPER(I.STATE_NAME_FI) = UPPER(S.STATE_NAME) )
WHERE EXISTS ( SELECT S.CAP_NAME
FROM INDIAN_STATES_REGION S
WHERE UPPER(I.STATE_NAME_FI ) = UPPER(S.STATE_NAME) )