need to add a 3rd join in from statement - giving error

I am trying to add a 3rd left join however once I added that second select statement I am getting errors.

(SELECT T2.completed,
       (SELECT MAX(completed)
         FROM log',mylogID, '
         WHERE completed < T2.completed) AS 1stcompleted
      FROM log',mylogID, ' T2
      ORDER BY T2.completed
     )TimeOrder2

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There error is

1 Unknown column 'TimeOrder.completed' in 'on clause'

So I am thinking I do not have them nested correctly.

The full code I am using is

SELECT
    @row := @row + 1 AS rownum,
    a.logId,
    L1.recordId,
    L2.recordId AS next_recordId,L3.completed AS 1stCompleted,
    L1.completed,
    L2.completed AS next_completed,
    L1.activityId AS activityJoin,
    L2.activityId AS next_activityId,
    IF(L1.activityId = L2.activityId, 1, NULL) AS isError,
     CASE
        when a.name LIKE ''%Enable%'' THEN time_to_sec(timediff(L2.completed, L1.completed)) / 3600
        ELSE NULL
        END AS coolingHours,
     TO_SECONDS(L2.completed) - TO_SECONDS(L1.completed) AS timeInSeconds,
    ((SUBSTR(l.details, INSTR(l.details, '':'') + 1))) AS charge,
    time_to_sec(timediff(''', endDate, ''', ''', startDate, ''')) / 3600 AS totalTimeRange,
    CONVERT_TZ(''', startDate, ''', ''UTC'', ''US/Pacific'') AS startingDate, 
    CONVERT_TZ(''', endDate, ''', ''UTC'', ''US/Pacific'') AS endingDate,
    ((L1.item', myItemID, ' - L1.item', myItemID2, ') * 
        (TIME_TO_SEC(TIMEDIFF(L2.completed, L1.completed)))) / 3600 AS kwDifference,
    ((L1.item', myItemID, ' - L1.item', myItemID2, ') * (SUBSTR(l.details, INSTR(l.details, '':'') + 1))) AS cost,
    ((((L1.item', myItemID, ' - L1.item', myItemID2, ') * (SUBSTR(l.details, INSTR(l.details,'':'') + 1)))
    * (TIME_TO_SEC(TIMEDIFF(L2.completed, L1.completed)) / 3600))) AS costT,
    DATABASE() AS databaseName, i.itemId ,l.details
FROM
    (SELECT @row:=0)R,
    (SELECT T1.completed,
       (SELECT MIN(completed)
         FROM log',mylogID, '
         WHERE completed > T1.completed) AS next_completed
      FROM log',mylogID, ' T1
      ORDER BY T1.completed
     )TimeOrder,(SELECT T2.completed,
       (SELECT MAX(completed)
         FROM log',mylogID, '
         WHERE completed < T2.completed) AS 1stcompleted
      FROM log',mylogID, ' T2
      ORDER BY T2.completed
     )TimeOrder2
        LEFT JOIN log', mylogID, ' L1 ON (L1.completed = TimeOrder.completed)
        LEFT JOIN log', mylogID, ' L2 ON (L2.completed = TimeOrder.next_completed)
        LEFT JOIN log', mylogID, ' L3 ON (L3.completed = TimeOrder2.1stcompleted)
        LEFT JOIN activities a ON L1.activityId = a.activityId
        LEFT JOIN logs l ON a.logId = l.logId
        inner join items i ON l.logId = i.logId AND i.name LIKE ''%KW PRE%'' 
    )ORDER BY L1.completed')

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portlightAsked:
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AielloJCommented:
portlight,

Try changing the alias name.  Generally, columns and aliases begin with letters.  It's also listed as a general best practice.  You might also want to fully qualify the 'completed' column in the WHERE clause.

Best regards,

AielloJ
Kevin CrossChief Technology OfficerCommented:
I agree.  In addition, it appears this is dynamic SQL (maybe in PHP? or other front end), so you can print out the command variable to see if there is an extra parenthesis, or other invalid syntax.  

Moreover, try to simplify things some.  Instead of the Cartesian product, you can put these two queries together.
 
(SELECT T1.completed,
       (SELECT MIN(completed)
         FROM log',mylogID, '
         WHERE completed > T1.completed) AS next_completed
      FROM log',mylogID, ' T1
      ORDER BY T1.completed
     ) TimeOrder,(SELECT T2.completed,
       (SELECT MAX(completed)
         FROM log',mylogID, '
         WHERE completed < T2.completed) AS 1stcompleted
      FROM log',mylogID, ' T2
      ORDER BY T2.completed
     )

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To:
 
(
    SELECT T1.completed
         , (SELECT MIN(T2.completed) 
            FROM log',mylogID, ' T2
            WHERE T2.completed > T1.completed) AS next_completed
         , (SELECT MAX(T2.completed) 
            FROM log',mylogID, ' T2
            WHERE T2.completed < T1.completed) AS frst_completed
    FROM log',mylogID, ' T1
    ORDER BY T1.completed
) TimeOrder

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As you simplify, it will help identify other issues.

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