sqlserver 分页的写法

SELECT
	*
FROM
	(
		SELECT
			TOP 20 *
		FROM
			(
				SELECT
					TOP(20 * 4)*
				FROM
					(SELECT cDwbh, cDwmc FROM kh)AS xxx
				ORDER BY
					cdwmc ASC
			)AS t1
		ORDER BY
			cdwmc DESC
	)AS t2
ORDER BY
	cdwmc ASC;