>>>>> "Andrew" == Andrew Gierth <and...@tao11.riddles.org.uk> writes:
>>> Whole-row vars when constructed never contain the null value. David> ...but what does this mean in end-user terms? Andrew> It means for example that this query: Andrew> select y from x left join y on (x.id=y.id) where y is null; Andrew> would always return 0 rows. On second thoughts I'll take this one back. Specifying that whole-row vars don't contain the null value when constructed doesn't actually result in no rows, since the construction is logically below the join; and hence even with that rule in place, the query would return a row for each non-matched "x" row. -- 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
