Question

Easy question… Is there any way to do a where clause comparing a number to two numbers in one statement? Something like this:

where 1000 > 500 > 300

The reason is, if I need to evaluate the 500 and it’s expensive this would save a lot of time over the alternative:

where 1000 > 500
  and 500 > 300

Answer 1

You can write

where 500 between 301 and 999

or

select a,b,c from (
   select a,b,c, 500 as d from ....
) where 1000 > d and d > 300

but there is also hope that the database is clever enough to figure out that it has to do the calculation only once.