目录this可以用来访问类的成员使用this访问类实例二级构造函数的委托带限定符的this在 Kotlin 中，this 关键字允许我们引用一个类的实例，该类的函数恰好正在运行。此外，还有其他方式可以使 this 表达式派上用场。
Taking Sql this quarter and not having any luck with the following question: The height of players in feet (inches/12).Include their name.Hint: Calculationor derived field.Be sure to give the calcul
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