On Tue, 2024-11-19 at 11:53 +0100, Moreno Andreo wrote: > > > What about if query becomes > > > SELECT foo1, foo2 FROM bar WHERE (POSITION(foo1 IN 'blah blah') >0) > > > > You could create an index like > > > > CREATE INDEX ON bar (position(foo1 IN 'blah blah')); > > > > Alternatively, you could have a partial index: > > > > CREATE INDEX ON bar (foo1) INCLUDE (foo2) > > WHERE position(foo1 IN 'blah blah') > 0; > > Interesting. Never seen this form, I'll look further on it. > > I stumbled into > https://www.cybertec-postgresql.com/en/indexing-like-postgresql-oracle/ > and discovered text_pattern_ops. > I'm wondering if it can be of any use in my index, that should hold a > WHERE condition with a combination of LIKE and the POSITION expression > above. > More docs to read ... :-) I don't think "text_pattern_ops" will help here - queries that use LIKE to search for a substring (LIKE '%string%') cannot make use of a b-tree index. Yours, Laurenz Albe
