How to join T_CONTRIBUTION and TX_CUST_MEMBERSHIP tables?

Hello all,
I have a question about joining T_CONTRIBUTION and TX_CUST_MEMBERSHIP tables. There is no unique key that identifies the relationship, so we tried to join on customer number and date (converting to smalldatetime cont_dt and create_dt columns), but I would like to know if there is a better way .

Thanks for your help!

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