需求：当天备份表刷新完数据后，拉取当天数据。

问题：备份表需要刷新完，才拉取数据

解决：

SELECT t.inv_date
  FROM rmsbak.cmx_item_loc_soh_bak t
 WHERE 1 = 1
   AND t.inv_date = trunc(SYSDATE)
   AND rownum = 1
   AND NOT EXISTS
 (SELECT object_name
          FROM gv$locked_object l,dba_objects o
         WHERE l.object_id　 = o.object_id
           AND o.object_name = upper('RMSBAK')
           AND o.object_name = upper('CMX_ITEM_LOC_SOH_BAK'));