SQL Server handles row-to-column and column-changing careers

Mastering SQL Server Row-to-column and column-changing careers

1. List of career change

After the data is processed, the data source of the front-end chart will be generated directly, but the data must be written into the intermediate table by the program, and the data can be queried directly from the intermediate table the next time the data is queried.

1.1 Column Line Wrapping syntax

Table_sourceunpivot (value_columnfor pivot_columnin (<column_list>))

1.2 Row to column case

With TAS (    Select 1 as Teamid, ' Test team 1 ' as team,80 ' men ', ' women '    UNION     SELECT 2 as Teamid, ' Test Team 2 ' as team,30 ' Men ', women ')---career------------------------------------SELECT teamid,team, Type=attribute,cnt=valuefrom T UNPIVOT (  VALUE for ATTRIBUTE in ([Men],[women])) as UPV

2, Row to column

Row-to-column data is primarily queried from the middle table, and the following versions of SQL SERVER2005 can be done using aggregate functions.

2.1 Row to column syntax

Table_sourcepivot (Aggregation function (value_column) for Pivot_columnin (<column_list>))

2.2, using pivot to achieve

With TAS (  select  1 as ID, ' Test team 1 ' team, ' Men ' item,80 CENT  UNION  SELECT  1 as ID, ' Test team 1 ' team, ' women ' item,20 CENT  Union  Select  2 as ID, ' Test Team 2 ' team, ' Men ' item,30 CENT  Union  Select  2 as ID, ' Test Teams 2 ' team, ' women ' item,70 CENT) SELECT * from-T PIVOT (SUM (CENT) for ITEM in ([Men],[women])) A

2.3, using the aggregation function to implement

With TAS (  select  1 as ID, ' Test team 1 ' team, ' Men ' item,80 CENT  UNION  SELECT  1 as ID, ' Test team 1 ' team, ' women ' item,20 CENT  Union  Select  2 as ID, ' Test Team 2 ' team, ' Men ' item,30 CENT  UNION  Select  2 as ID, ' Test team 2  ' TEAM, ' women ' item,70 CENT) SELECT id,team,sum (case when item= "men" then CENT ELSE 0 END) "Men", SUM (case when item= ' women ') Then CENT ELSE 0 END) ' Women ' from Tgroup by Id,team

Resources

Http://www.cnblogs.com/zhangzt/archive/2010/07/29/1787825.html

Http://www.cnblogs.com/aspnethot/articles/1762665.html

SQL Server handles row-to-column and column-changing careers