>> How do I use "TRIM" and "UPPER" both in the SQL statement and still
use the index.>> I created an index on myTable in the following way>> CREATE INDEX index_fname_myTable ON myTable USING
btree(upper(fname));>> Now the SQL I used was>>> SELECT * FROM myTable where upper(trim(fname))= 'JOHN':: character
varying>> The postgresql doesnt use the index on fname in the above case.>> But if I use only "UPPER" in the SQL
statement,the postgresql uses
the index.> For eg. SELECT * FROM myTable where upper(fname)= 'JOHN':: character
varying
And what happens if you re-write it as
SELECT * FROM myTable where trim(upper(fname))= 'JOHN':: character varying
Alternatively try
CREATE FUNCTION uppertrim (character varying) returns character varying as '
select upper(trim($1));
' LANGUAGE SQL IMMUTABLE ;
and then
CREATE INDEX index_fname2_myTable ON myTable USING btree (uppertrim(fname));
Regards, Christoph
