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数据库的简单操作
庄周梦蝶
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关联操作原理个人理解：通过两张表中相同的字段来关联起来；左外链接就是以左边的表为主体，右边的表为副体，显示是主体表的内容会显示完，副表的内容只显示能匹配上的；右外链接和左外链接正好相反；转内连接只需要把副表null值不显示出来即可。






预处理原理个人理解：把重要的部分条件给用占位符代替，然后把需要传进去的值给到变量，然后在处理的时候在给传进去；

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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