mysql - Filter register from two tables -

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i new here , php/mysql programming. need next consult in database.

i have 2 tables:

-the first of relations between users friends have value "2" columns like:

id  |  username1  |  username2  |  relation

-the seconds messages post users columns like:

id  |  username  |  message

the id "primary key" auto increment property. (in both)

i want show message of friends of 1 user order of post (most first)

so need select max value id user1 , user2 friends, need select max value of "messages table" , check if friends in "relations table"

i know next not syntax need this:

  select message     message_table    max(id) , (  relations                        (   (   user1="randomuser"                                    or user2="randomuser")                                , relation="2")                      ) order id desc

i know wrong... need 2 filters show friend message in posting order.. how can show register 1 table 1 condition in table , second condition in other table.

pd:sorry bad english

edit: example:

id  |  username1  |  username2  |  relation 1      randomuser1   randomuser2     2 2      randomuser1   randomuser3     0 3      randomuser1   randomuser5     2  id  |  username  |  message   1      randomuser1   hi random message?     2      randomuser2   don"t message     3      randomuser5   sure, bad message

so want show message of friends of randomuser1 order of posting

first user"s friends of randomuser1 randomuser2 , randomuser5 (the "2" mean friends) want show messages of friends order of posting (by id order of second table (message_table))

so need output like:

id  |  username  |  message   3      randomuser5   sure, bad message 2      randomuser2   don"t message

that output need when choose messages of friends of user randomuser1


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