MySql adding a join gives incorrect results

Question

I\'m trying to join two tables here, so I get the total rows for a particular user based on postStatus. The data is correct without the join, but when I add a join, I get weird

Answer 1

I think you have to yoin with userid and postId

select
  a.userId,
  sum(a.postStatus = 0) published,
  sum(a.postStatus = 1) inactive,
  sum(a.postStatus = 5) recalled,
  sum(a.postStatus = 6) deleted,
  sum(b.postStatus = 10) unChecked
from userData a join userdatamod b on a.userId = b.userId and a.postId=b.postId where a.userId = 1;