Suggestion: Explain how to move objects to the default tablespace in sql-altertable.html

Hello,

Today I wanted to move an object to the unnamed defaul tablespace. It 
took me a while to find out that neither the empty string '' nor the 
word default works, but that you have to use pg_default.

This should be mentioned in the documentation of the ALTER TABLE command 
(and maybe others).


-- 
Holger Jakobs, Bergisch Gladbach, Tel. +49-178-9759012