[postgis-users] Query to select features that are parallel and perpendicular

[Sindile Bidla]

Anyone who can offer advice on on building a query to accomplish the
following within the same line feature - roads:

1. create a new table or view of all line features that are parallel to a
selected line feature within the same line feature

2. create a new table or view of all line features that
are perpendicular to a selected line feature within the same line feature
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