On Wed, Jun 22, 2011 at 8:57 PM, Pavel Stehule <pavel.steh...@gmail.com>wrote:
> 2011/6/22 Peter Eisentraut <pete...@gmx.net>: > > On ons, 2011-06-22 at 02:39 -0700, Samuel Gendler wrote: > >> Pavel suggested using a collation of ucs_basic, but I get an error > >> when I > >> try that on linux: > >> > >> $ createdb -U u1 --lc-collate=ucs_basic -E UTF-8 test > >> createdb: database creation failed: ERROR: invalid locale name > ucs_basic > > > > ucs_basic is a collation name, which is an SQL object. The argument of > > createdb --lc-collate is an operating system locale name. You can't mix > > the two, even though they are similar. > > > > ok, what I can to select, when I would to use a C like default order? > > You can specify 'order by f1 using ~<~' or 'order by f1 using ~>~' in your query. If you want your queries to use an index when ordering or comparing strings via LIKE, then you need to create a separate index that uses varchar_pattern_ops instead of the default varchar_ops. The db will automatically use the varchar_pattern_ops index when appropriate. varchar_pattern_ops uses C-like collation. create index t1_f1_pattern on t1 (f1 varchar_pattern_ops)
