一、PIVOT

1.1 语法：PIVOT(聚合函数(列) FOR 列 in (…) )AS P

1.2 测试数据

CREATE TABLE [StudentScores] ( [UserName] NVARCHAR(20), --学生姓名 [Subject] NVARCHAR(30), --科目 [Score] FLOAT, --成绩 ) INSERT INTO [StudentScores] SELECT '张三', '语文', 80 INSERT INTO [StudentScores] SELECT '张三', '数学', 90 INSERT INTO [StudentScores] SELECT '张三', '英语', 70 INSERT INTO [StudentScores] SELECT '张三', '生物', 85 INSERT INTO [StudentScores] SELECT '李四', '语文', 80 INSERT INTO [StudentScores] SELECT '李四', '数学', 92 INSERT INTO [StudentScores] SELECT '李四', '英语', 76 INSERT INTO [StudentScores] SELECT '李四', '生物', 88 INSERT INTO [StudentScores] SELECT '码农', '语文', 60 INSERT INTO [StudentScores] SELECT '码农', '数学', 82 INSERT INTO [StudentScores] SELECT '码农', '英语', 96 INSERT INTO [StudentScores] SELECT '码农', '生物', 78

1.3 行转列sql

SELECT * FROM [StudentScores] /*数据源*/ AS P PIVOT ( SUM(Score/*行转列后 列的值*/) FOR p.Subject/*需要行转列的列*/ IN ([语文],[数学],[英语],[生物]/*列的值*/) ) AS T

二、UNPIVOT

2.1 语法:table_source UNPIVOT(value_column FOR pivot_column IN(<column_list>))

2.2 测试数据

CREATE TABLE ProgrectDetail ( ProgrectName NVARCHAR(20), --工程名称 OverseaSupply INT, --海外供应商供给数量 NativeSupply INT, --国内供应商供给数量 SouthSupply INT, --南方供应商供给数量 NorthSupply INT --北方供应商供给数量 ) INSERT INTO ProgrectDetail SELECT 'A', 100, 200, 50, 50 UNION ALL SELECT 'B', 200, 300, 150, 150 UNION ALL SELECT 'C', 159, 400, 20, 320 UNION ALL

2.3 列转行sql

SELECT P.ProgrectName,P.Supplier,P.SupplyNum FROM ( SELECT ProgrectName, OverseaSupply, NativeSupply, SouthSupply, NorthSupply FROM ProgrectDetail )T UNPIVOT ( SupplyNum FOR Supplier IN (OverseaSupply, NativeSupply, SouthSupply, NorthSupply ) ) P

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