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postgres psql tricks

Set all null fields to NULL:

After this, the query results look like this:

Set the command history file names for each host and database:

After this, the history file naming look like this:

Set the number of commands to store in the command history:

Set timing on and see how long query took:

psql prompt can be customized to your preference:

After this, the PROMPT1 look like this:

And PROMPT2 is empty.
Complete information can be found here, under prompting.

Set client encoding:

Final .psqlrc file look like this:

One additional tip is to add less to PAGER environment variable if you want to use less rather than more. So simply add following row to profile (/etc/profile or ~/.profile):

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