廢話不多說了,直接給大家貼代碼了,具體代碼如下所示:
-- 開窗函數:在結果集的基礎上進一步處理(聚合操作) -- Over函數,添加一個字段顯示最大年齡 SELECT * , MAX(StuAge) OVER ( ) MaxStuAge FROM dbo.Student; -- Over函數,添加一個字段顯示總人數 SELECT * , COUNT(StuID) OVER ( ) StuCount FROM dbo.Student; -- Partition By 分組統計數量 -- 根據性別分組後,統計 SELECT COUNT(*) OVER ( PARTITION BY StuSex ) , * FROM dbo.Student; -- 根據班級分組後,統計、排序 SELECT COUNT(*) OVER ( PARTITION BY Class ORDER BY Height) , * FROM dbo.Student; -- Over函數,添加一個字段顯示平均身高 SELECT * , AVG(Height) OVER ( ) AgeHeight FROM dbo.Student; --Row_Rumber() SELECT ROW_NUMBER() OVER ( ORDER BY StuID DESC ) RowNumber , * FROM dbo.Student --Row_Rumber() 實現分頁效果 ; WITH T AS ( SELECT ROW_NUMBER() OVER ( ORDER BY StuID DESC ) RowNumber , * FROM dbo.Student ) SELECT * FROM T WHERE T.RowNumber BETWEEN 1 AND 3; --Rank() 排名函數,名次相同,跳過 SELECT RANK() OVER ( ORDER BY Height ) , * FROM dbo.Student; --DENSE_Rank() 排名函數,名次相同不跳過 SELECT DENSE_RANK() OVER ( ORDER BY Height ) , * FROM dbo.Student; -- NTILE()函數,參數:記錄總數/劃分區域 = 每個區域數組,把記錄序號放進數組 (平均分組) SELECT NTILE(3) OVER ( ORDER BY StuSex ) , * FROM dbo.Student;
以上所述是小編給大家介紹的SQL Server 2012 開窗函數,希望對大家有所幫助,如果大家有任何疑問歡迎給我留言,小編會及時回復大家的!