如何只能插入数据
在php中，往表中连续插入数据的时候已经知道会有重复的值，但是如何做到只向其中插入不重复的值，重复值自动无法插入呢，不采用unique key,primary Key。
insert into('a','b','c') table_name values ('a1','a2','a3'),('a4','a5','a6'),('a8','a7','a9').表中重复值('a4','a5','a6')，如何做到无法插入('a4','a5','a6')，但是可以插入('a1','a2','a3'),(('a8','a7','a9')。
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