select * from (select * from (select e.*,rownum rn from emp e) a1 where a1.rn<=(当前页*分页单位)) a2 where a2.rn>(当前页-1)*分页单位
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select * from (select * from (select e.*,rownum rn from emp e) a1 where a1.rn<=(当前页*分页单位)) a2 where a2.rn>(当前页-1)*分页单位
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