Database Case Insensitive Index?

Question

I have a query where I am searching against a string:

SELECT county FROM city WHERE UPPER(name) = \'SAN FRANCISCO\';

Now, this works fine,

Answer 1

PostgreSQL also supports indexing the results of a function:

CREATE INDEX mytable_lower_col1_idx ON mytable (lower(col1));

The only other option I can think of is to de-normalize your data a bit by creating another column to hold the upper-case version (updated by triggers) and index that. Blech!