Oracle merge command - missing keyword

Question

I'm trying to use the Oracle MERGE command and am getting an error saying ORA-00905: missing keyword

The query I'm trying is as follows

MERGE INTO vor_extract v USING
(SELECT dealer, wip_no, 
        required_date, required_time 
FROM vor_extract_temp
) t 
ON (v.dealer = t.dealer AND v.wip_no = t.wip_no)
WHEN MATCHED THEN
  UPDATE
  SET v.required_date = t.required_date,
    v.required_time   = t.required_time;

any clues anyone?

It's probably something simple as I've not used the MERGE statement before so am no doubt just missing something

Thanks all

Answer 1

Generally, the syntax seems valid. But in case you are using oracle versions earlier than 10g, the

 WHEN NOT MATCHED ...

clause is also mandatory