NULL值致使的排序异常

1、NULL值致使的排序异常sql 若是begintime,有null值,那么排序是会有问题,结果会将begintime为空的明细放在报表最前面显示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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