>>>>> "Tom" == Tom Lane <t...@sss.pgh.pa.us> writes:

 >> select nth_value(x) from first ignore;

 Tom> No, because once IGNORE is a keyword, even unreserved, it's not
 Tom> legal as an AS-less alias.

That rule only applies in the select-list, not in the FROM clause; table
aliases in FROM are just ColId, so they can be anything except a fully
reserved or type_func_name keyword.

-- 
Andrew (irc:RhodiumToad)

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