How to pivot rows into columns (custom pivoting)

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夕颜 2020-11-27 05:27

I have a Sql Database table similar to the following:

Day   Period    Subject

Mon   1         Ch
Mon   2         Ph
Mon   3         Mth
Mon   4         CS
M


      
      
        
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                   青春惊慌失措
                                             
                
                
                (楼主)
            
              
              
                2020-11-27 05:51
              

            
            
                        
Use cross apply to get all the values in a comma delimted format in a single column. instead of "7" different columns. The following query can be used for any column-> row mapping

SELECT DISTINCT Day, [DerivedColumn] FROM  A CROSS APPLY ( SELECT Period + ',' FROM  B WHERE A.Day = B.Day Order By Period FOR XML PATH('') ) AS C (DerivedColumn)
You will get [Ch,Ph,Mth,CS2,Lab1,Lab2,Lab3] in one column for Mon and so on ... You could use this as a table to query for any particular Day.
Hope this helps

                                                        

              
                
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