/*mysql> select LOG(20);+----------------+| LOG(20) |+----------------+| 2.995732273554 |+----------------+1 row in set (0.00 sec)mysql> select LOG(20, 40);+-----------------+| LOG(20, 40) |+-----------------+| 1.2313782131598 |+-----------------+1 row in set (0.01 sec)*/ select LOG(20);select LOG(20, 40);
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