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Android sqlite 把用户名密码，与另外一个表关联起来的方法

现在做了一个登陆注册的功能，这是数据库的一个表又做了一个功能类似日记的纪录功能，如何将这两个表关联起来，实现每人在登陆之后都看到的是自己的日记纪录，而不是所有人日记纪录？表的格式是表1 id username password 表2 id notename notecontent date

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