/*mysql> select ABS(0);+--------+| ABS(0) |+--------+| 0 |+--------+1 row in set (0.00 sec)mysql> select ABS(-1);+---------+| ABS(-1) |+---------+| 1 |+---------+1 row in set (0.00 sec)mysql> select ABS(1);+--------+| ABS(1) |+--------+| 1 |+--------+1 row in set (0.01 sec)*/ select ABS(0);select ABS(-1);select ABS(1);
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