oracle將多條數據合併成一條

select  t.col1,t.col2  ,wmsys.wm_concat(t.col3||' ') AS col3 ,  wmsys.wm_concat(t.col4||'') as col4,wmsys.wm_concat(t.col5||'') as col5,wmsys.wm_concat(t.col6||'') as col6  from tablename t GROUP BY 

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