Learning PostgreSQL and SQL in general probably begins with the concept of TABLES. Then probably VIEWS, INDEXES and maybe TRIGGERS.
Some users might not ever go any further, which is sad, because there is so much more to explore!
I thought it would be cool to automatically generate a graph showing the dependencies between objects and their types.
This shows the order in which the different types of objects can be created,
perhaps mentally useful to think in terms of “after we have created a TABLE we can create an INDEX”.
Something like this would be nice to include in the PostgreSQL documentation online.
I think it would be helpful when learning about PostgreSQL different object types.
The graph below was produced using GraphViz dot command and live-data from pg_catalog.pg_depend:
As we can see, before anything else, we need a SCHEMA, which is the root node.
Once we have a SCHEMA, we can create TABLES, TYPES, VIEWS, SEQUENCES and FUNCTIONS.
Some users might not even know about SCHEMAs, as the schema “public” is pre-installed.
To create an INDEX, we first need a TABLE.
Etc, etc, etc…
You might be surprised FUNCTION and LANGUAGE have arrows pointing in both directions.
Turns out you need some functions before you can create a language like plperl, such as plperl_call_handler.
The self-referencing arrow from/to FUNCTION is less surprising as some functions can of course call other functions.
(Not all object types are included in this graph as I’m not using them all in my system.)
Joel on SQL 
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This shows the order in which the different types of objects can be created,
perhaps mentally useful to think in terms of “after we have created a TABLE we can create an INDEX”. more information here
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