sql 'is not' ( <> ) is not working

Question

I have no idea what I do wrong... this is my code:

SELECT *
FROM messages
WHERE userId = \"6\"
OR toUserId = \"6\"
OR toAll = \"1\"
AND id <> \"4\"
ORDER          


        

Answer 1

You need to use parenthesis to indicate operator precedence:

WHERE (
       userId   = "6"
    OR toUserId = "6"
    OR toAll    = "1"
)
AND id <> "4"

Answer 2

I think your Query condition should be like this:

WHERE 
(userId = "6" OR toUserId = "6" OR toAll = "1") 
AND (id <> "4")

Your query will be evaluated to:

WHERE 
  (userId = "6" OR toUserId = "6") OR (toAll = "1" AND id <> "4")

Which is not what you want.