也许是一个子查询：
select * from order o where o.order_num in (select distinct order_num from order where tstamp between '2010-01-03' and '2010-01-09')
也许是一个子查询：
select * from order o where o.order_num in (select distinct order_num from order where tstamp between '2010-01-03' and '2010-01-09')
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