Product of two date ranges tables

Hi,

I need to check if the product of two date ranges tables is empty or not. For example:

1. gives TRUE
   • table A
     • I EQ 20141016
     • I GE 20150101
   • table B
     • I LE 20141130
2. gives FALSE
   • table A
     • I EQ 20141016
     • I GE 20150101
   • table B
     • I LT  20141016

Do you have any idea how to check such conditions?