How to convert columns to rows in sql server

Question

Please consider this table:

ID         Page          Line           C01          C02          C03        
---------------------------------------------------------------------
1          122            11             1            0            1
1          123            11             1            1            1
1          124            12             0            0            0
1          125            16             1            0            1
1          127            11             0            1            0

I want to convert this table to this one:

ID         Page          Line           City         Value
-----------------------------------------------------------
1          122            11            C01            1           
1          122            11            C02            0  
1          122            11            C03            1  
1          123            11            C01            1  
1          123            11            C02            1  
1          123            11            C03            1  
...

How I can do this in appropriate way?

Answer 1

Use UNPIVOT. Try something like:

SELECT ID, Page, Line, City, Value
FROM SourceTable
UNPIVOT
   (Value FOR City IN 
      (C01, C02, C03)
)AS unpvt;

Where 'SourceTable' is your source table name. (Note: I can't test this at the moment, so it may not be exactly right.)

Full details here: http://msdn.microsoft.com/en-us/library/ms177410(v=sql.105).aspx