Rank() over (partition by……order by……）與dense_rank() over (partition by……order by……）的區別
篩選出每個月，門診就診人次前5的疾病。 Rank() over (partition by……order by……）的用法與效果： SELECT * from (SELECT a.`醫療機構名稱`,a.時間,a.疾病組名稱,a.門診就診人次,Rank() over (partition by a.`醫療機構名稱`,a.時間 order by a.門診就診人次 desc) as totalfee
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相關文章
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