Slow query on “UNION ALL” view

Question

I have a DB view which basically consists of two SELECT queries with UNION ALL, like this:

CREATE VIEW v AS
SELECT time, etc. FROM t1 /         


        

Answer 1

I do not know Postgres, but some RMDBs handle comparison operators worse than BETWEEN in case of indexes. I would make an attempt using BETWEEN.

SELECT ... FROM v WHERE time BETWEEN ... AND ...