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automaticly define a type of variable with the layout of a datafile

Posted by RdJ 
should be nice to have a type of variable (like a structure) that automaticly defines al the elements that are used in the layout of a data file or query

so if the data file looks like this

file: person (or query person)
id is int
name is string(255)
dateofbirth is date
salary is currency

i would like to define the structure
abc is structure file person (or query person)

when i then want to use a variable from this structure f.e. the name of the first person

it should be nice to have additional parms here that you can include or exclude the composit keys of s file

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