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 SELECT max(SYS_CONNECT_BY_PATH(COLUMN_NAME, ','))
  from (SELECT A.COLUMN_NAME, ROWNUM AS ROWNO
          from USER_TAB_COLUMNS A
         WHERE TABLE_NAME = 'A_USER'
         order by a.COLUMN_ID)
start with ROWNO = 1
connect by ROWNO = rownum;


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SVRMGR>connect internal
SVRMGR>shutdow ......

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