select cast(round(12.5,2) as numeric(5,2)) 解释: round()函数,是四舍五入用,第一个参数是我们要被操作的数据,第二个参数是设置我们四舍五入之后小数点后显示几位. numeric函数的2个参数,第一个表示数据长度,第二个参数表示小数点后位数. cast as numeric(5,2)函数,是为了四舍五入之后的数字能确保显示小数点.
Flume环境搭建_五种案例 http://flume.apache.org/FlumeUserGuide.html A simple example Here, we give an example configuration file, describing a single-node Flume deployment. This configuration lets a user generate events and subsequently logs them to the conso
Flume环境搭建_五种案例 http://flume.apache.org/FlumeUserGuide.html A simple example Here, we give an example configuration file, describing a single-node Flume deployment. This configuration lets a user generate events and subsequently logs them to the conso