oracle 选取出现次数最多的前５条数据
时间：2022-03-10 17:06
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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