Hi,

> INSERT (OR REPLACE/IGNORE) INTO table1 SELECT * FROM table2
> Do you have specific requirements for the UPDATE features of MERGE ?

the issue with "insert or replace" is that it will match on primary keys,
additionally (I am not 100% sure) it deletes first the row to replace it.
we cannot update then only 1 column.

furthermore, the merge can delete as well, it does the join on the fields
we want (not only PK), it is really wonderful.
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