Question

Expertz plz plz HELP 🙁

i have a relationship table

r_id    usera   userb   active
13       5         1      0
16       1         2      0

now i want to check if some other users are friends with id no 1 and give me other ids except 1

like for this query i expect the ans to be empty because the condition active=1 is not met

if the condition returns true than i would expect the result as 5,2

so i have formed this query

note:user_id keeps on changing depending upon the session

$user_id = 1
SELECT CASE 
        WHEN `usera`=$user_id 
        THEN `userb` 
        ELSE `usera` END  
FROM  `relationship`  
WHERE `usera`=$user_id 
    OR `userb`=$user_id and `active`='1'

now the problem is even if the conditon is not met(i.e active=1) it still gives me userb
i want the query to return as empty or null

Thanks,

Answer 1

You are missing some parentheses:

SELECT CASE 
        WHEN `usera`=$user_id 
        THEN `userb` 
        ELSE `usera` END  
FROM  `relationship`  
WHERE `usera`=$user_id 
    OR (`userb`=$user_id and `active`='1')

or even this which is probably what you are looking for:

SELECT CASE 
        WHEN `usera`=$user_id 
        THEN `userb` 
        ELSE `usera` END  
FROM  `relationship`  
WHERE (`usera`=$user_id OR `userb`=$user_id) 
  and `active`='1'