Oracle单行合并多行实现

SELECT wmsys.wm_concat(d.v_defectlist)
 FROM PM_DEFECT D 
 WHERE D.V_GUID IN (SELECT DW.V_DEFECT_GUID FROM PM_DEFECTTOWORKORDER DW WHERE DW.V_WEEK_GUID='8A675763-467A-413D-E053-2F02650A7A6E');