sql - how to make multi_friends relationship -


i have database contains tables: user, post, , comment. able make diagram show relationship between them.

one user has many posts, many likes , many comments.

one post or comment has many likes.

post can have comment also.

see diagram :enter image description here

my question how can make friendship user, (user has many friends) please give me diagram or strategy it, thanks.

table 

friends --- source_user_id  fk user dest_user_id    fk user

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