[ci skip] Add feature section and normalize prologue with other guides.
Also change Json => JSON. Fill Ruby's Range & IPAddr link.
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@ -10,6 +10,15 @@ To get started with PostgreSQL have a look at the
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[configuring Rails guide](configuring.html#configuring-a-postgresql-database).
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It describes how to properly setup Active Record for PostgreSQL.
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After reading this guide, you will know:
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* How to use PostgreSQL's datatypes.
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* How to use UUID Primary keys.
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* How to implement Full text search with PostgreSQL.
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--------------------------------------------------------------------------------
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Datatypes
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---------
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@ -99,7 +108,7 @@ profile.settings_will_change!
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profile.save!
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```
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### Json
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### JSON
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* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-json.html)
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* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-json.html)
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@ -129,7 +138,7 @@ Event.where("payload->'kind' = ?", "user_renamed")
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* [type definition](http://www.postgresql.org/docs/9.3/static/rangetypes.html)
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* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-range.html)
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This type is mapped to Ruby [`Range`]() objects.
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This type is mapped to Ruby [`Range`](http://www.ruby-doc.org/core-2.1.1/Range.html) objects.
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```ruby
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# db/migrate/20130923065404_create_events.rb
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@ -279,7 +288,7 @@ user.save!
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* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-net-types.html)
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The types `inet` and `cidr` are mapped to Ruby [`IPAddr`]() objects. The
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The types `inet` and `cidr` are mapped to Ruby [`IPAddr`](http://www.ruby-doc.org/stdlib-2.1.1/libdoc/ipaddr/rdoc/IPAddr.html) objects. The
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`macaddr` type is mapped to normal text.
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### Geometric Types
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