mysql using outside alias to 2 level deep subquery - mysql

Question

I'm currently stuck here and don't know what to do next since I can't use the tv_main alias into the 2 level deep subquery. Here's my code (I commented the part that have a problem). Any help will be appreciated. Thanks.
SELECT tv_main.id,
tv_main.vesselName,
(
SELECT SUM(t_statCtr.status = 'EX CREW')
FROM
(
(
SELECT tpi_stat.id,
tvv.vesselName,
lastname,
firstname,
middlename,
IF(tpi_stat.returningCrew = 1, 'NEW HIRE',
IF(COUNT(tc_ctr.personnel_id) > 1, 'EX CREW', 'NEW HIRE')
)
AS status
FROM tbl_contracts AS tc_stat
LEFT JOIN tbl_personnel_info AS tpi_stat
ON tpi_stat.id = tc_stat.personnel_id
LEFT JOIN tbl_contracts AS tc_ctr
ON tpi_stat.id = tc_ctr.personnel_id
LEFT JOIN tbl_vessels AS tvv
ON tvv.id = tpi_stat.lastJoinedVsl
WHERE
tpi_stat.emp_status = 'ON-BOARD'
AND tc_stat.status = 'ACTIVE'
AND tvv.id = tv_main.id --This line have an error, (Unknown Column tv_main.id in where clause)
GROUP BY tc_stat.personnel_id
) AS t_statCtr
)
) AS ex_crew,
NULL AS new_hire
FROM tbl_vessels AS tv_main -- I need this one to use inside the subquery
LEFT JOIN tbl_personnel_info AS tpi
ON tv_main.id = tpi.lastJoinedVsl
LEFT JOIN tbl_contracts AS tc
ON tpi.id = tc.personnel_id
WHERE
tpi_stat.emp_status = 'ON-BOARD'
AND tc_stat.status = 'ACTIVE'
GROUP BY tv_main.vesselName

Answer 1

I finally solve it. I didn't know that mysql only allow correlation of 1 deep level.
SELECT tv_main.vesselName,
SUM(t_dummy.statusx = 'EX CREW') AS ex_crew,
SUM(t_dummy.statusx = 'NEW HIRE') AS new_hire
FROM tbl_vessels AS tv_main
LEFT JOIN tbl_personnel_info AS tpi_main
ON tpi_main.lastJoinedVsl = tv_main.id
LEFT JOIN tbl_contracts AS tc_main
ON tc_main.personnel_id = tpi_main.id
LEFT JOIN
(
SELECT tvv.id,
tpi_stat.id AS tpiid,
IF(tpi_stat.returningCrew = 1, 'NEW HIRE',
IF(COUNT(tc_ctr.personnel_id) > 1, 'EX CREW', 'NEW HIRE')
)
AS statusx
FROM tbl_contracts AS tc_stat
LEFT JOIN tbl_personnel_info AS tpi_stat
ON tpi_stat.id = tc_stat.personnel_id
LEFT JOIN tbl_contracts AS tc_ctr
ON tpi_stat.id = tc_ctr.personnel_id
LEFT JOIN tbl_vessels AS tvv
ON tvv.id = tpi_stat.lastJoinedVsl
GROUP BY tc_stat.personnel_id
) AS t_dummy
ON tpi_main.id = t_dummy.tpiid
WHERE
tpi_main.emp_status = 'ON-BOARD'
AND tc_main.status = 'ACTIVE'
AND t_dummy.id = tv_main.id
GROUP BY tv_main.vesselName;