Hi all,
I want to use index on the gene_symbol column in my
query and gene_symbol is indexed. but when I use
lower (gene_symbol) like lower('%mif%'), the index
is not used. While when I change to
lower(gene_symbol) = lower('mif'), the index is used
and index scan works, but this is not what I
Hi,
Searches with like or regexes often can't use the index. Think of the index as
a sorted list of your items. It's easy to find an item when you know it
starts with mif so ('mif%' should use the index). But when you use a
'like' that starts with '%' the index is useless and the search needs to
Josh Berkus [EMAIL PROTECTED] writes:
In regular text fields containing words, your problem is solvable with full
text indexing (FTI). Unfortunately, FTI is not designed for arbitrary
non-language strings. It could be adapted, but would require a lot of
hacking.
I'm not sure why you say
