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How can you compare 2 periods?


What I'm trying to do:

Customer can pick two dates and the following gets calculated:

sum (all registration before date1) - sum (all registration before date2)

How is this normally achieved without extensions? And if extensions are recommended which one?

The best I could think of myself is an extra table with dates in which the user can choose a period. And use the min and max date from that period as date1 and date2.

Any ideas/thoughts are welcome and very much appreciated.