How can you compare tables using a loop

I have a single local table that stores snapshots from other tables located on remote databases. I'm trying to compare each snapshot against the remote databases, and any changes I store back into the table (which will be then be used for the next comparison to track new changes).
How would I go about doing this so one clicked button would go through all the databases
here is an example
table T1 consists of data from T2, T3, T4...Tn
and T2 is at databases D2, T3@D3 and so on

I have a single local table that stores snapshots from other tables located on remote databases. I'm trying to compare each snapshot against the remote databases, and any changes I store back into the table (which will be then be used for the next comparison to track new changes).
How would I go about doing this so one clicked button would go through all the databases
here is an example
table T1 consists of data from T2, T3, T4...Tn
and T2 is at databases D2, T3@D3 and so on

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