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SELECT * FROM tb
WHERE [datetime字段]>CAST('2012-3-1' AS DATETIME)
AND [datetime字段]<CAST('2012-5-5' AS DATETIME)
--先检查一下上面的SQL查询出的数据
SELECT * FROM tb
WHERE [datetime字段]>CAST('2012-3-1' AS DATETIME)
AND [datetime字段]<CAST('2012-10-5' AS DATETIME)
--再运行下面的检查数据