Simultaneous calls

Question

I\'m trying to calculate the number of simultaneous calls at the time a particular call is made by looking at the datetime ranges. My query works, but takes ~10 minutes to p

Answer 1

Use SQL like this to get a list of start/end events...

Select CallStart, 1 As CallCount From #rg
Union All
Select CallEnd, -1 From #rg
Order By CallStart

...then treat this as a simple running totals problem, which is solved differently depending upon your SQL Server version or can be easily addressed in code if that's an option.