MySQL学习笔记18：数学函数

绝对值函数ABS(x)和圆周率函数PI() mysql> SELECT ABS(0.5), ABS(-0.5), PI(); +----------+-----------+----------+ | ABS(0.5) | ABS(-0.5) | PI() | +----------+-----------+----------+ | 0.5 | 0.5 | 3.14

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