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I'm now using the extension of pgRouting, driving_distance, to search for the distance along the river system: enter image description here

In the figure, the starting point is 3, but I want to get the distance starting from all other different starting point, and I don't want to change the number in the code again and again.

Is there a way that can make driving_distance return all sets of distance from different starting points at one time?

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