深入解析:python学智能算法(三十九)|使用PyTorch模块的normal()函数绘制正态分布函数图pre { white-space: pre !important; word-wrap: normal !important; overflow-x: auto !important; display: block !importa…
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exists : 强调的是是否返回结果集,不要求知道返回什么, 比如:select name from student where sex m and mark exists(select 1 from grade where ...) ,只要exists引导的子句有结果集返回,那么exists这个条件就算成立了,大家注意返回的字段…