oracle 选取出现次数最多的前５条数据

SELECT
	*
FROM
	(
		SELECT
			PROJECT_LISTING.MATERIAL,
			COUNT (*) AS "出现次数"
		FROM
			PROJECT_LISTING
		WHERE
			PROJECT_LISTING.MATERIAL IS NOT NULL
		GROUP BY
			PROJECT_LISTING.MATERIAL
		ORDER BY
			COUNT (*) DESC
	) WHERE　ROWNUM <= 5

	ORDER BY
			COUNT (*) DESC　是关键排序

COUNT (*) AS "出现次数"　　这个可以不写，只是为了看的明白

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oracle 选取出现次数最多的前５条数据

原文：http://blog.csdn.net/hjm4702192/article/details/25292045