Can psql show the column type of a result ?

["Nils O. SelÃsdal" <noselasd@xxxxxxxxxxxxxxxxxxxxx>]

 Hello,
I'm wondering if there's a way to show the column type of a result with 
psql, e.g.

> select sum(r) from mytable;
   r
-------
 101.0

I'd like to see the type of the 'r' column.


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