Database storing directory-like structure question

I have a database with a column called File which store the fullpath and name of a file.
e.g. "\root\myfolder1\myfile.txt"
My problem is I would like to retrieve all content inside a particular folder, e.g. all content inside \root. What should I do?
Thank you very much~

thx...
but the problem is I just want to have the direct children inside the folder.
e.g., I got 3 entries in the database
"\root\layer1\layer2\a.txt"
"\root\layer1\"
"\root\layer1\b.txt"
I don't want to have those "\root\layer1\b.txt" or "\root\layer1\layer2\a.txt" returned.
Thank you very much again.

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