In the Join Tables Platform, what's the difference between Update main table with data from second table and
Merge same name columns?
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Update main table with data from second table assumes that the user wants to Merge same name columns.
So, it's kind of a special case of Merge same name columns.
If Merge same name columns is selected, then any selected columns from the Main Table [will be] Updated with data form second table.
So, no Merge same name columns without Updat[ing] main table with data from second table.
[but it does more than that - it also adds new column which were not in the original table]