MySQL函数学习笔记一：数学函数

1. ABS(x): 返回x的绝对值mysql mysql> select ABS(1), ABS(-1), ABS(0); +--------+---------+--------+ | ABS(1) | ABS(-1) | ABS(0) | +--------+---------+--------+ |      1 |       1 |      0 | +--------+-------

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