MySQL Complex Insert With Conditional Subselect?

What you have seems fine. You can try using COALESCE(stream. Author_id, comment.

Author_id) so if the comment author_id is null (e.g. Because the author_id is the sender) it will fall back on the stream's author_id. For this to work, you have to outer join comment on stream, and the stream. Author_id!

= '$senderId' condition has to be part of the ON clause.

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