有时候会碰到行转列的需求(也就是将列的值作为列名称),通常我都是用 CASE END + 聚合函数来实现的。如下:declare @t table(StudentName nvarchar(20), Subject nvarchar(20), Score int)Insert i ...
有时候会碰到行转列的需求(也就是将列的值作为列名称),通常我都是用 CASE END + 聚合函数来实现的。
如下:
declare @t table(StudentName nvarchar(20), Subject nvarchar(20), Score int)Insert into @t (StudentName,Subject,Score) values ( '学生A', '中文', 80 ); Insert into @t (StudentName,Subject,Score) values ( '学生A', '数学', 78 ); Insert into @t (StudentName,Subject,Score) values ( '学生A', '英语', 92 ); Insert into @t (StudentName,Subject,Score) values ( '学生B', '中文', 89 ); Insert into @t (StudentName,Subject,Score) values ( '学生B', '数学', 87 ); Insert into @t (StudentName,Subject,Score) values ( '学生B', '英语', 75 ); Insert into @t (StudentName,Subject,Score) values ( '学生C', '中文', 92 ); Insert into @t (StudentName,Subject,Score) values ( '学生C', '数学', 74 ); Insert into @t (StudentName,Subject,Score) values ( '学生C', '英语', 65 ); Insert into @t (StudentName,Subject,Score) values ( '学生D', '中文', 79 ); Insert into @t (StudentName,Subject,Score) values ( '学生D', '数学', 83 ); Insert into @t (StudentName,Subject,Score) values ( '学生D', '英语', 81 ); Insert into @t (StudentName,Subject,Score) values ( '学生E', '中文', 73 ); Insert into @t (StudentName,Subject,Score) values ( '学生E', '数学', 84 ); Insert into @t (StudentName,Subject,Score) values ( '学生E', '英语', 93 ); Insert into @t (StudentName,Subject,Score) values ( '学生F', '中文', 79 ); Insert into @t (StudentName,Subject,Score) values ( '学生F', '数学', 86 ); Insert into @t (StudentName,Subject,Score) values ( '学生F', '英语', 84 ); select StudentName, sum(case when Subject = N'中文' then Score else 0 end) Chinese, sum(case when Subject = N'数学' then Score else 0 end) Math, sum(case when Subject = N'英语' then Score else 0 end) Engilsh from @t group by StudentName
原标题:sql server pivot/unpivot 行列互转
关键词:sql
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