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Merge pull request #356 from lewiszlw/patch-1

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Fix chapter2 comma typo
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@ -437,7 +437,7 @@ WHERE family = 'Sharks'
GROUP BY observation_month;
```
`date_trunc('month'，timestamp)` 函数用于确定包含 `timestamp` 的日历月份，并返回代表该月份开始的另一个时间戳。换句话说，它将时间戳舍入成最近的月份。
`date_trunc('month', timestamp)` 函数用于确定包含 `timestamp` 的日历月份，并返回代表该月份开始的另一个时间戳。换句话说，它将时间戳舍入成最近的月份。
这个查询首先过滤观察记录，以只显示鲨鱼家族的物种，然后根据它们发生的日历月份对观察记录果进行分组，最后将在该月的所有观察记录中看到的动物数目加起来。