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I have two databases, A, and B. On database A, I have a table X, with 10 columns in it. On database B, I have a table Y, with 7 columns in it. 4 of the columns from these tables match, and whenever one table updates one or more of these columns, I need the other table to update these columns. How can I do this? Replication wouldn’t seem to work because the table structures are different, and insert/update triggers would seem to create infinite loops.
To avoid the loops you could have your triggers not do an update if the values are equal?