sql时间比较查询当前时间的数据，前一条，后一条

select top 1 * from CheckBill where datediff(second,'2011-05-05 15:56:00',checkDate) > 0 order by CheckDate ascselect top 1 * from CheckBill where datediff(second,checkDate,'2011-05-05 15:56:00') > 0

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