Umm, what I've meant is how to use postgresql

on_conflict_do_update in such a way that sqlalchemy would use executemany 
behind the scenes.

In examples it usage looks like this.

stmt = insert(table, values)
stmt = stmt.on_conflict_do_update(set_=dict(a=stmt.excluded.a))

excluded is generated from values, right? If I don't pass values to the 
statement, how can I use excluded?

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The Python SQL Toolkit and Object Relational Mapper

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