sql行列转换方法整理(SQL ranks conversion method of finishing).docVIP

sql行列转换方法整理(SQL ranks conversion method of finishing).doc

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sql行列转换方法整理(SQL ranks conversion method of finishing)

sql行列转换方法整理(SQL ranks conversion method of finishing) 1.-- ranks conversion Table name of subjects Zhang San Chinese 80 Zhang San mathematics 90 Three physics 85 Li Si Chinese 85 Lee four physics 82 Li Si English 90 Li four political 70 Wang Wu English 90 After conversion table: name of mathematical physics English Chinese politics Li four 082908570 Wang five 009000 Zhang SanExample: Create table CJ: create table CJ ( ID Int IDENTITY (1,1) not null, and ID -- to create columns, each new record will add 1 Name Varchar (50), Subject Varchar (50), Result Int, Primary key (ID) - ID was defined as the primary key of the CJ table ); --Truncate table CJ --Select * from CJ Insert into CJ Select three, Chinese, 80 union all Select three, mathematical, 90 union all Select three, physical, 85 union all Select Li four, Chinese, 85 union all Select Li four, physical, 82 union all Select Lee four, English, 90 union all Select Lee four, politics, 70 union all Select five King, English, 90 The ranks of the conversion -- Declare @sql varchar (8000) Set @sql =Select Name as name Select @sql = @sql + sum (case , Subject when+Subject+ then Result else 0 end [+Subject+]) From (select distinct Subject from CJ as CJ) - the names of all the subjects are listed only Select @sql = @sql+from CJ group by name Exec (@sql) 2. - with the ranks of the conversion The original table: class number 11 12 13 21 22 31 After conversion table: class number 1 1,2,3 2 1,2 31 Example: Create table ClassNo: create table ClassNo ( ID Int IDENTITY (1,1) not null, and ID -- to create columns, each new record will add 1 Class Varchar (50), - class list Number Varchar (50), - ID column Primary Key (ID) - ID was defined as the primary key of the ClassNo table ); --Truncate Table ClassNo --Select * from ClassNo Insert Into ClassNo Select 1,1 Union all Select 1,2 Union all Select 1,3 Union all Select 2,1 Union all Select 2,2 Union all Select 3,1 Create a merge function --Drop Function KFReturn Create Functi

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