php - getting mysql data for different users -

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If I have two users, then a user has many posts in the post table, like 

  postid,

And I have another table for friends, for example 

  id, friendly, user-id, franc_syn (i.e. timestamp )  / code>

Now I want the user's friend to look at the user's posts after the date on which they user Added as TRI. Not from old to date, he added them as a friend. How do I do this in a single MySQL query?

After making this, all the posts of people will be seen by friends 12:

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