MYSQL Query using id in subquery or join - mysql

Question

I am trying to get the earliest review date for users based on a 28day, 6week and 13week cycle, when a 6week review is performed an entry is also made in the 28day table (effectively resetting it), and when a 13week review is performed an entry is made in both the 28day and 6week table.
This all works fine when I specify a specific user, but I would like to perform a select on the user table and have this calculated for each user and appended to the end of the row.
The offending line are the ones like this
WHERE `user_review_28_user_id` = '6'
that provide the list of users, but only the matching one, in this case user_id=6 is populated.
What I am trying to do is
WHERE `user_review_28_user_id` = `user_id`
but the user_id is not propagated through to the sub-query, therefore I get 'NULL' entries for the user_review_next field and user_review_next_type.
Things I have tried include JOIN and VARIABLES eg,
SELECT *, #user_id:=user_id
FROM `user`
and replacing the offending WHERE with this
WHERE `user_review_28_user_id` = #user_id
This is my query as it stands, been at it several hours and now it is holding me back :(
SELECT `user_id`, `user_first`, `user_last`, `user_review_next`, `user_review_next_type`
FROM `user`
LEFT JOIN (
SELECT *
FROM
(
SELECT `user_review_28_user_id` as user_review_id, DATE_ADD(`user_review_28_date`, INTERVAL 28 DAY) AS 'user_review_next', '1' AS 'user_review_next_type'
FROM `user_review_28`
WHERE `user_review_28_user_id` = '6'
UNION
SELECT `user_id` as user_review_id, DATE_ADD(`user_start_date`, INTERVAL 28 DAY) AS 'user_review_next', '1' AS 'user_review_next_type'
FROM `user`
WHERE `user_id` = '6'
ORDER BY `user_review_next` DESC
LIMIT 1
) AS tmp_28d
UNION
SELECT *
FROM
(
SELECT `user_review_6_user_id` as user_review_id, DATE_ADD(`user_review_6_date`, INTERVAL 6 WEEK) AS 'user_review_next', '2' AS 'user_review_next_type'
FROM `user_review_6`
WHERE `user_review_6_user_id` = '6'
UNION
SELECT `user_id` as user_review_id, DATE_ADD(`user_start_date`, INTERVAL 6 WEEK) AS 'user_review_next', '2' AS 'user_review_next_type'
FROM `user`
WHERE `user_id` = '6'
ORDER BY `user_review_next` DESC
LIMIT 1
) AS tmp_6w
UNION
SELECT *
FROM
(
SELECT `user_review_13_user_id` as user_review_id, DATE_ADD(`user_review_13_date`, INTERVAL 13 WEEK) AS 'user_review_next', '3' AS 'user_review_next_type'
FROM `user_review_13`
WHERE `user_review_13_user_id` = '6'
UNION
SELECT `user_id` as user_review_id, DATE_ADD(`user_start_date`, INTERVAL 13 WEEK) AS 'user_review_next', '3' AS 'user_review_next_type'
FROM `user`
WHERE `user_id` = '6'
ORDER BY `user_review_next` DESC
LIMIT 1
) AS tmp_13w
ORDER BY user_review_next ASC, user_review_next_type DESC
LIMIT 1
) AS tmp_user_review
ON user.user_id = tmp_user_review.user_review_id
This is an example output from the query as shown above.
1 David Berry NULL NULL
2 Joseph Armstrong NULL NULL
3 Thomas Brown NULL NULL
4 Paul Armstrong NULL NULL
5 Calum Blair NULL NULL
6 Craig Bridges 2015-05-27 1
7 Donald Branscombe NULL NULL
8 Kenneth Bacon NULL NULL
9 Jason Bambrick NULL NULL
SQLFiddle

Answer 1

Have you tried this?
SELECT `user_id`, `user_first`, `user_last`, `user_review_next`, `user_review_next_type`
FROM `user`
LEFT JOIN (
SELECT *
FROM
(
SELECT `user_review_28_user_id` as user_review_id, DATE_ADD(`user_review_28_date`, INTERVAL 28 DAY) AS 'user_review_next', '1' AS 'user_review_next_type'
FROM `user_review_28`
UNION
SELECT `user_id` as user_review_id, DATE_ADD(`user_start_date`, INTERVAL 28 DAY) AS 'user_review_next', '1' AS 'user_review_next_type'
FROM `user`
WHERE `user_id` = '6'
ORDER BY `user_review_next` DESC
LIMIT 1
) AS tmp_28d
UNION
SELECT *
FROM
(
SELECT `user_review_6_user_id` as user_review_id, DATE_ADD(`user_review_6_date`, INTERVAL 6 WEEK) AS 'user_review_next', '2' AS 'user_review_next_type'
FROM `user_review_6`
UNION
SELECT `user_id` as user_review_id, DATE_ADD(`user_start_date`, INTERVAL 6 WEEK) AS 'user_review_next', '2' AS 'user_review_next_type'
FROM `user`
WHERE `user_id` = '6'
ORDER BY `user_review_next` DESC
LIMIT 1
) AS tmp_6w
UNION
SELECT *
FROM
(
SELECT `user_review_13_user_id` as user_review_id, DATE_ADD(`user_review_13_date`, INTERVAL 13 WEEK) AS 'user_review_next', '3' AS 'user_review_next_type'
FROM `user_review_13`
UNION
SELECT `user_id` as user_review_id, DATE_ADD(`user_start_date`, INTERVAL 13 WEEK) AS 'user_review_next', '3' AS 'user_review_next_type'
FROM `user`
WHERE `user_id` = '6'
ORDER BY `user_review_next` DESC
LIMIT 1
) AS tmp_13w
ORDER BY user_review_next ASC, user_review_next_type DESC
LIMIT 1
) AS tmp_user_review
ON user.user_id = tmp_user_review.user_review_id
WHERE tmp_user_review= '6'

Answer 2

This is what I have come up with, but now I get an error
#1104 - The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
Unless I include the line SET SQL_BIG_SELECTS=1; before the query, so I am hoping someone will still jump in and help my sort my SQL woes
SELECT `user_id`,
`user_first`,
`user_last`,
LEAST
(
DATE_ADD(user_review_28_date, INTERVAL 28 DAY),
DATE_ADD(user_review_6_date, INTERVAL 6 WEEK),
DATE_ADD(user_review_13_date, INTERVAL 13 WEEK)
) AS user_review_next_date,
CASE
WHEN LEAST
(
DATE_ADD(user_review_28_date, INTERVAL 28 DAY),
DATE_ADD(user_review_6_date, INTERVAL 6 WEEK),
DATE_ADD(user_review_13_date, INTERVAL 13 WEEK)
) = DATE_ADD(user_review_28_date, INTERVAL 28 DAY) THEN '1'
WHEN LEAST
(
DATE_ADD(user_review_28_date, INTERVAL 28 DAY),
DATE_ADD(user_review_6_date, INTERVAL 6 WEEK),
DATE_ADD(user_review_13_date, INTERVAL 13 WEEK)
) = DATE_ADD(user_review_6_date, INTERVAL 6 WEEK) THEN '2'
WHEN LEAST
(
DATE_ADD(user_review_28_date, INTERVAL 28 DAY),
DATE_ADD(user_review_6_date, INTERVAL 6 WEEK),
DATE_ADD(user_review_13_date, INTERVAL 13 WEEK)
) = DATE_ADD(user_review_13_date, INTERVAL 13 WEEK) THEN '3'
END AS user_review_next_type
FROM `user` AS a
LEFT JOIN
(
SELECT user_review_28_user_id, user_review_28_date
FROM `user_review_28`) AS b_28
ON a.user_id = b_28.user_review_28_user_id
AND b_28.user_review_28_date=(SELECT MAX(user_review_28_date)
FROM `user_review_28` AS c_28
WHERE a.user_id = c_28.user_review_28_user_id
)
LEFT JOIN
(
SELECT user_review_6_user_id, user_review_6_date
FROM `user_review_6`) AS b_6
ON a.user_id = b_6.user_review_6_user_id
AND b_6.user_review_6_date=(SELECT MAX(user_review_6_date)
FROM `user_review_6` AS c_6
WHERE a.user_id = c_6.user_review_6_user_id
)
LEFT JOIN
(
SELECT user_review_13_user_id, user_review_13_date
FROM `user_review_13`) AS b_13
ON a.user_id = b_13.user_review_13_user_id
AND b_13.user_review_13_date=(SELECT MAX(user_review_13_date)
FROM `user_review_13` AS c_13
WHERE a.user_id = c_13.user_review_13_user_id
)
WHERE a.user_assessor_id ='5'
ORDER BY user_review_next_date ASC, user_review_next_type DESC