编程日志 | nohup.net

where 后 分组计数：

[

   // Stage 1: Filter pizza order documents by pizza size

   {

      $match: { event: "$pageview" }

   },

   // Stage 2: Group remaining documents by pizza name and calculate total quantity

docker run -it -d -p 1521:1521 -v /data/oracle:/data/oracle --name oracle11g registry.cn-hangzhou.aliyuncs.com/hel/oracle_11g

docker ps

ipv6的转换算法，其实算是Python3的ipaddress内置库对应算法，移植为PL/SQL。

create or replace function bitmoveleft(a in number, b in number)   return number is

  Result number;

begin

   Result := a*power(2,b);