How can I split a single column of multiple subscription numbers into individual columns in SQL?-Mysql Tutorial-php.cn

How can I split a single column of multiple subscription numbers into individual columns in SQL?

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Release： 2024-12-17 01:47:24

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How can I split a single column of multiple subscription numbers into individual columns in SQL?

Splitting Subscription Numbers into Multiple Columns

In a situation where a single column contains multiple values, such as a subscription number, splitting these values into individual columns can be a useful data manipulation technique. Here's a step-by-step guide:

1. Cross Apply XML Fragmentation:

This approach utilizes XML fragmentation to convert the subscription number into an XML document, allowing individual values to be extracted as separate nodes.

Cross Apply (
    Select Pos1 = ltrim(rtrim(xDim.value('/x[1]','varchar(max)')))
          ,Pos2 = ltrim(rtrim(xDim.value('/x[2]','varchar(max)')))
          ,Pos3 = ltrim(rtrim(xDim.value('/x[3]','varchar(max)')))
          ,Pos4 = ltrim(rtrim(xDim.value('/x[4]','varchar(max)')))
          ,Pos5 = ltrim(rtrim(xDim.value('/x[5]','varchar(max)')))
          ,Pos6 = ltrim(rtrim(xDim.value('/x[6]','varchar(max)')))
          ,Pos7 = ltrim(rtrim(xDim.value('/x[7]','varchar(max)')))
    From  (Select Cast('<x>' + replace((Select replace(replace(A.SomeCol,' ','-'),'-','§§Split§§') as [*] For XML Path('')),'§§Split§§','</x><x>')+'</x>' as xml) as xDim) as A 
) B

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Here, xDim is the fragmentation element that converts the subscription number string into XML. The resulting nodes, numbered as x[1], x[2], and so on, are extracted into the target columns.

2. Creating Table on-the-fly:

Alternatively, you can create the target table dynamically during the query execution. This eliminates the need for an explicit table creation statement beforehand.

Select A.PUB_FORM_NUM
      ,B.*
 Into  MyNewPubTable
 From  @YourTable A
 Cross Apply (
                Select Pos1 = ltrim(rtrim(xDim.value('/x[1]','varchar(max)')))
                      ,Pos2 = ltrim(rtrim(xDim.value('/x[2]','varchar(max)')))
                      ,Pos3 = ltrim(rtrim(xDim.value('/x[3]','varchar(max)')))
                      ,Pos4 = ltrim(rtrim(xDim.value('/x[4]','varchar(max)')))
                      ,Pos5 = ltrim(rtrim(xDim.value('/x[5]','varchar(max)')))
                      ,Pos6 = ltrim(rtrim(xDim.value('/x[6]','varchar(max)')))
                      ,Pos7 = ltrim(rtrim(xDim.value('/x[7]','varchar(max)')))
                From  (Select Cast('<x>' + replace((Select replace(replace(A.PUB_FORM_NUM,' ','-'),'-','§§Split§§') as [*] For XML Path('')),'§§Split§§','</x><x>')+'</x>' as xml) as xDim) as A 
             ) B

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This approach creates the MyNewPubTable and inserts the split subscription number values directly into the targeted columns.

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