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（四）MySQL函数function一、数学函数1.绝对值函数：ABS(x)ABS(x)用于返回x的绝对值mysql> select abs(10), abs(-10), abs(0), abs(10.1);+---------+----------+--------+-----------+| abs(10) | abs(-10) | abs(0) | abs(10.1) |+---------+----------+--------+-----------+| 10 |