MySql ajoutant une jointure donne des résultats incorrects

Je pense que vous devez utiliser userid et 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;