Edmund Bacon <[EMAIL PROTECTED]> writes:
> On Mon, 2004-03-08 at 08:19, Daniel Henrique Alves Lima wrote:
>> Is there a way to create a "functional index" over a string
>> concatenation of two columns ?
> test=# create index str_idx on strtable( textcat(str1, str2) );
As of 7.4 you can do it more directly:
create index str_idx on strtable( (str1 || str2) );
The disadvantage of the textcat() locution is that the planner will only
match it up to queries that also say textcat().
regards, tom lane
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