下面的update语句改成merge提示ORA-00060死锁，为啥会有死锁？
UPDATE APP_QUEUE_STATIC A
SET (A.HANDING_NUM, A.LAST_HANDING_NUM, A.CHANGE_TIME) =
(SELECT F.HANDING_NUM, F.LAST_HANDING_NUM, SYSDATE
FROM (SELECT B.OBJECTVALUE AS A ...
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