定义:Define the skeleton of an algorithm in an operation,deferring some steps to subclasses.Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithms structure.定义一个操作中的算法的框架,而…
创建两张表先单独插入两条数据然后批量插入部门号为10,20,30,40的数据各10499099条然后dept表也插些干扰数据测试语句开始验证in和exists和join 先比较个占比多的部门,再比较占比少的 1、 in 占比多 select count(*) from scott.EMP_TEST e where e.deptno in (sele…