mybatis plus 平均值函数

在MyBatis Plus中，平均值函数可以通过使用`selectAvg`方法来实现。你可以在`QueryWrapper`或`LambdaQueryWrapper`中使用该方法来计算字段的平均值。例如：

QueryWrapper<MemberLevel> queryWrapper = new QueryWrapper<>();
queryWrapper.selectAvg("level_sort as avgLevelSort");

这个查询会返回一个字段名为`avgLevelSort`的结果，它是`level_sort`字段的平均值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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