Update statement with inner join on Oracle

I have a query which works fine in MySQL, but when I run it on Oracle I get the following error:

SQL Error: ORA-00933: SQL command not properly ended
00933. 00000 - "SQL command not properly ended"

The query is:

UPDATE table1
INNER JOIN table2 ON table1.value = table2.DESC
SET table1.value = table2.CODE
WHERE table1.UPDATETYPE='blah';

---

That syntax isn't valid in Oracle. You can do this:

UPDATE table1 SET table1.value = (SELECT table2.CODE
                                  FROM table2 
                                  WHERE table1.value = table2.DESC)
WHERE table1.UPDATETYPE='blah'
AND EXISTS (SELECT table2.CODE
            FROM table2 
            WHERE table1.value = table2.DESC);

Or you might be able to do this:

UPDATE 
(SELECT table1.value as OLD, table2.CODE as NEW
 FROM table1
 INNER JOIN table2
 ON table1.value = table2.DESC
 WHERE table1.UPDATETYPE='blah'
) t
SET t.OLD = t.NEW

(It depends if the inline view is considered updateable by Oracle).

---

Oracle does not support joins in the UPDATE statements.

Use this:

MERGE
INTO    table1 trg
USING   (
        SELECT  t1.rowid AS rid, t2.code
        FROM    table1 t1
        JOIN    table2 t2
        ON      table1.value = table2.DESC
        WHERE   table1.UPDATETYPE='blah'
        ) src
ON      (trg.rowid = src.rid)
WHEN MATCHED THEN UPDATE
    SET trg.value = code;

---

Merge with where clause worked for me:

merge into table1
using table2
on (table1.id = table2.id)
when matched then update set table1.startdate = table2.start_date
where table1.startdate > table2.start_date;

You need the WHERE clause because columns referenced in the ON clause cannot be updated.

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