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Just to refocus on the OP, the question was, (given the example 'one-off' solution that BrowserUk illustrated for this specific example, and considering the similarly-coded 'one-off' solutions by the OP in the past) where does there exist a "general purpose" mechanism to further abstract the process of doing this kind of transformation, such that there is no need to modify the 'one-off' code every time someone wants a different 'pivot' of the data structure.

The question is now mostly academic, since the humble aspirant has gone on to code a solution himself, absent a preexisting and obvious choice out there.

It is called 'vpath_pivot', named after the 'pivot table' feature found in spreadsheet software. It generates arbitrarily-nested tree structures using perl data variables, constructed from queries like:

### 1: provides same output as BrowserUk example TREE_SELECT genre,title,fname,lname FROM tvshow WITH_LEVELS ('genre','title' ) WITH_RECORD ( 'lname','fname' ) ### 2: a different 'pivot' of the same data TREE_SELECT title,genre,fname,lname FROM tvshow WITH_LEVELS ('title','genre','lname' ) WITH_RECORD ( 'fname' ) WHERE genre != 'gameshow' ### 3: another tree 'pivot' (more compact) TREE_SELECT title,fname,lname FROM tvshow WITH_LEVELS ('title' ) WITH_RECORD ( 'fname','lname' )

NOTE: the above is not SQL, it just looks similar for readability.

NOTE: the main approach here is to give the user the ability to 'slice and dice' the 'flat' data into different 'tree structures' all within a simple syntax (i.e., no need to re-edit the perl code).

tyvm for the replies

In reply to Re^3: tree-oriented query against table-oriented data by dimar
in thread tree-oriented query against table-oriented data by dimar

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