Check if some ids are inside a campaign

Hi IliasKatsis 

Thanks for your screenshots. 

The known conditions are,
1. You want to get the description from the campaigns table and put it into the Transcation table,
2. Use the date of the Transcation table to filter the campaigns table,
3. Use the coupon_id of the Transcation table to filter the Campaign details, and then you want to filter the campaigns table by this
one idea is 

Current Camp = 
var _t1=SELECTCOLUMNS(FILTER(ALL('Campaign details'),'Campaign details'[Coupon ID]= MIN(Transactions[coupon_id])),"s",[Campaign ID])
return 
MAXX (
    FILTER (
        Campaigns,
        Campaigns[StartDate]<=MIN(Transactions[Transaction Date] )
            && Campaigns[EndDate]>=MIN(Transactions[Transaction Date])&& Campaigns[Campaign ID] in _t1
    ),
    Campaigns[Description]
)

result (based on my sample)

Best Regards,

Community Support Team _Tang

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