MySQL學習筆記18：數學函數

絕對值函數ABS(x)和圓周率函數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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