与sinatra一起使用(Use whenever with sinatra)

 您可以按降序排列，并接收将成为数据库中最后一行的第一行。 但事情是你以错误的方式存储日期。 正如@Strawberry所提到的那样，它不清楚日期或月份。 我建议你使用mysql datetime选项，那么你可以简单地做我下面发布的代码。 在这种情况下，您可能必须以正确的方式解析每个日期 
 
$englishgrades = StudentHistory::select('date', 'name', 'grade')
->where('subject', 'english')
->groupBy('name')
->orderBy('date','desc')
->get();

You can do descending order and receive first row which is going to be your last row in database. But the thing is you store date in a wrong way. as mentioned by @Strawberry its not clear date or month. I would suggest you to do use mysql datetime option then you can simply do the code I post below. In this case you might have to parse each date for a proper way
 
$englishgrades = StudentHistory::select('date', 'name', 'grade')
->where('subject', 'english')
->groupBy('name')
->orderBy('date','desc')
->get();