摘要:
Local classes can most definitely reference instance variables. The reason they cannot reference non final local variables is because the local class 阅读全文
摘要:
1.trunc函数 1).trunc(date) 格式:trunc(date,fmt) trunc用于截取时间,即便你指定不同的格式类型,返回的类型始终都是时间类型。 示例: with dates as ( select date'2015-01-01' d from dual union sele 阅读全文