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Epoch column works in "join...on", but not in "join...using()". Why?
Using the hidden "epoch" column this works: select * from table1 t1 join table2 t2 on t1.epoch = t2.epoch and t1.device_id = t2.device_id This throws an error message about "epoch not in table1": select * from table1 t1 join table2 t2 using( epoch, device_id ) Why is it an error?