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I have to store blog style comments in a database. Each comment can have a parent one.
I am doing it with a column called ‘parentComment’ that has a null value when it is a top level comment or have a value if it is a response to another comment.
What is the most efficient way to retrieve a comment and all its childs?
A quite common technique is to also have a (duplicate, indirectly) relation to the ‘root’ of the tree, which means you can select the full tree in one neat select. Othewise it quickly gets dirty.