发出一个sql语句或sql命令，让数据库执行，那么sql语句在数据库内部就要被解析，建立它的execution plan(执行规划(计划))，然后按照执行计划去执行。
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该方法开销小，且能产生优化的执行规划。
This method can guarantee the generation of optimization execution plan and costs a little.
它也包括所有的决策任务和在执行规划工作中所涉及到的职责。
It also encompasses all the decision-making roles and responsibilities involved in executing the program effort.
巴西尔登地方议会认为，他们只是在执行规划法，法律人人都要遵守。
Basildon council argues that it is simply enforcing planning law, by which all citizens must abide.
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