NULL值致使的排序異常

1、NULL值致使的排序異常sql 若是begintime,有null值，那麼排序是會有問題，結果會將begintime爲空的明細放在報表最前面顯示session set v_sql=v_sql||' a4 as (select indcode,begintime,rownumber() over(order by ' || v_orderTag ||') as tag4 from session

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