On Fri, May 28, 2010 at 2:48 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Peter Eisentraut <pete...@gmx.net> writes: >> So while it's true that the collation is used by the operations (> and >> ORDER BY), the information which collation to use comes with the data >> values. It's basically saying, a is in language "de", so sort it like >> that unless told otherwise. There is also an override syntax available, >> like this: > >> SELECT * FROM test WHERE a COLLATE en > 'baz' ORDER BY b COLLATE sv; > > That seems fairly bizarre. What does this mean: > > WHERE a COLLATE en > b COLLATE de > > ? If it's an error, why is this not an error > > WHERE a COLLATE en > b > > if b is marked as COLLATE de in its table?
I think we need to think of the comparison operators as ternary, and the COLLATE syntax applied to columns or present in queries as various ways of setting defaults or explicit overrides for what the third argument will end up being. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise Postgres Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
