albttx

PostgreSQL & PostGIS Cheatsheet

This is a collection of information on PostgreSQL and PostGIS for what I tend to use most often.

TOC

• Installing Postgres & PostGIS
• Using Postgres on the command line: PSQL
• Importing Data into Postgres
• Exporting Data from Postgres
• Joining Tables

albttx

class Tree
  attr_reader :data

  def initialize(data)
    @data = data
  end

  def +(other)
    Tree.new(deep_merge(@data, other.is_a?(Tree) ? other.data : other))
  end