>>>>> "bill" == bill wilson <bill.wilson.h...@gmail.com> writes:
bill> This a toy example from a 'upsert' script that appends new data: bill> select a from (select 1 as a) as t1 where not exists (select bill> true from (select 2 as a) t2 where a=a) ; bill> a bill> ─── bill> (0 rows) bill> Please tell me this a bug. We can see in the first query bill> without naming the tables that 'a=a' uses table t2 for both bill> columns. Of course it's not a bug. The column "a" in the inner scope hides the column "a" in the outer scope, as explicitly required by the spec (6.6 <identifier chain> in sql2008). -- Andrew (irc:RhodiumToad) -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
