Postgres Strings比较特殊

Question

有人可以解释以下矛盾吗？

select 'b.0'<'b00.0';
 ?column?
----------
 t

但

select 'b.g'<'b00.g';
 ?column?
----------
 f

Answer 1

那是collation issue。尝试

select '.0' < '00', '.9' < '00', '.9' < '00' collate "C";
 ?column? | ?column? | ?column? 
----------+----------+----------
 t        | f        | t

http://wiki.postgresql.org/wiki/Todo:ICU