Sql: Optimizing BETWEEN clause

Question

I wrote a statement that takes almost an hour to run so I am asking help so I can get to do this faster. So here we go:

I am making an inner join of two tables :

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Answer 1

Your SQL is equivalent to:

select m.measure. m.time, 
     i.entry_time, i.exit_time
from intervals i
    join measures m
        on m.time Between i.entry_time And i.exit_time  
order by time asc

The only thing I might suggest is making sure there's an index on m.Time. Then if that doesn't improve performance enough, try adding indices on i.Start_Time and i.End_Time as well