Mysql IF statement return issues - mysql

Question

I have this query where the IF lines are only partially returning correct result:
SELECT
COALESCE((SELECT COUNT(ID) FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID = USERS.ID),0) AS ADDED,
COALESCE((SELECT SUM(CASE WHEN USERS_BUCKETS.STATUS='Completed' THEN 1 ELSE 0 END) FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID = USERS.ID),0) AS DONE,
COALESCE((SELECT COUNT(ID) FROM USERS_LIKES WHERE USERS_LIKES.USERID = USERS.ID),0) AS NUM_LIKES,
COALESCE((SELECT COUNT(ID) FROM FOLLOW WHERE FOLLOW.USER_ID=USERS.ID),0) AS FOLLOWING,
COALESCE((SELECT COUNT(ID) FROM FOLLOW WHERE FOLLOW.FOLLOW_ID=USERS.ID),0) AS FOLLOWERS,
(SELECT IF(ADDED >= 5,1,0)) AS IFADDED,
(SELECT IF(DONE >= 3,1,0)) AS IFDONE,
(SELECT IF(NUM_LIKES >= 5,1,0)) AS IFNUM_LIKES,
(SELECT IF(FOLLOWING >= 5,1,0)) AS IFFOLLOWING,
(SELECT IF(FOLLOWERS >= 3,1,0)) AS IFFOLLOWERS,
(SELECT IF(ADDED >= 5,1,0) + IF(DONE >= 3,1,0) + IF(NUM_LIKES >= 5,1,0) + IF(FOLLOWING >= 5,1,0) + IF(FOLLOWERS >= 3,1,0)) AS PROGRESS
FROM USERS
WHERE USERS.ID=?
Result:
ADDED: 20
IFADDED: 1
DONE: 9
IFDONE: 0 //should be 1
NUM_LIKES: 11
IFNUM_LIKES: 1
FOLLOWING: 11
IFFOLLOWING: 0 //should be 1
FOLLOWERS: 10
IFFOLLOWERS: 0 //should be 1
PROGRESS: 2
What's wrong? All IF values should be 1 and PROGRESS should be 5.
Note: I am using PDO in php, but I don't think that matters at all.

Answer 1

I have no idea why your code is working. The columns are definitely not the column aliases defined earlier in the query.
To do what you want, use a subquery and simplify the logic:
SELECT u.*, (ADDED >= 5) AS IFADDED,
(DONE >= 3) AS IFDONE,
(NUM_LIKES >= 5) AS IFNUM_LIKES,
(FOLLOWING >= 5) AS IFFOLLOWING,
(FOLLOWERS >= 3) AS IFFOLLOWERS,
((ADDED >= 5) + (DONE >= 3) + (NUM_LIKES >= 5) + (FOLLOWING >= 5) +
(FOLLOWERS >= 3)
) AS PROGRESS
FROM (SELECT COALESCE((SELECT COUNT(ID) FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID = USERS.ID),0) AS ADDED,
COALESCE((SELECT SUM(CASE WHEN USERS_BUCKETS.STATUS='Completed' THEN 1 ELSE 0 END) FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID = USERS.ID),0) AS DONE,
COALESCE((SELECT COUNT(ID) FROM USERS_LIKES WHERE USERS_LIKES.USERID = USERS.ID),0) AS NUM_LIKES,
COALESCE((SELECT COUNT(ID) FROM FOLLOW WHERE FOLLOW.USER_ID=USERS.ID),0) AS FOLLOWING,
COALESCE((SELECT COUNT(ID) FROM FOLLOW WHERE FOLLOW.FOLLOW_ID=USERS.ID),0) AS FOLLOWERS
FROM USERS
WHERE USERS.ID = ?
) u;
This takes advantage of the fact that MySQL treats booleans as integers in a numeric context, with "1" for true and "0" for false.
EDIT: I should also note that the coalesce() is unnecessary because count() will return 0 when there are no matches.