Subject RE: [firebird-support] union and order by
Author Svein Erling Tysvær
>Have tested and the difference is still enormous, some factor 10.
>As predicted the added between is slightly quicker than the union construction and thanks for that tip. This is in
>fact quite useful for me as currently I have to convert a OR SQL in code (VB) to the UNION and as you can imagine
>that can be quite tricky, particularly if there is an order by. So, I will change this code now to add the between
>instead and that will be a lot simpler.

It would be interesting to see the PLANs with the OR and UNION (and some information about the chosen indexes). I simply cannot remember anything like this with Fb 1.5.