Oracle SubQuery (Display subquery columns) - sql

Question

I cannot seem to find via searching how I would be able to return some of the columns from the the below sub queries. Specifically B.TAP_STAT_HSL/C.TAP_STAT_HSL. I'm not sure if I should be joining instead, but any help would be greatly appreciated.
SELECT
A.HSE_KEY_HSE AS HOUSEKEY,
A.DROP_STAT_HSE AS DROPSTATUS
A.TAP_STAT_HSL AS ITAPSTAT
FROM OPS$SEA.HSE_BASE,OPS$SEA.HSL_LOB,OPS$SEA.OOR_ORDER_OPEN A
WHERE A.HSE_KEY_HSE = A.HSE_KEY_HSL
AND A.HSE_KEY_HSL = A.HSE_KEY_OOR
AND A.DROP_STAT_HSE = '1'
AND A.LOB_IND_HSL = 'I'
AND A.TAP_STAT_HSL IN ('0','2')
AND A.ORD_STAT_OOR <> 'O'
AND EXISTS (SELECT 1
FROM OPS$SEA.HSE_BASE B,OPS$SEA.HSL_LOB B, OPS$SEA.OOR_ORDER_OPEN B
WHERE A.HSE_KEY_HSE = B.HSE_KEY_HSE
AND B.HSE_KEY_HSE = B.HSE_KEY_HSL
AND B.HSE_KEY_HSL = B.HSE_KEY_OOR
AND B.DROP_STAT_HSE = '1'
AND B.LOB_IND_HSL = 'C'
AND B.TAP_STAT_HSL IN ('0','2')
AND B.ORD_STAT_OOR <> 'O')
AND EXISTS (
SELECT 1
FROM OPS$SEA.HSE_BASE C,OPS$SEA.HSL_LOB C, OPS$SEA.OOR_ORDER_OPEN C
WHERE A.HSE_KEY_HSE = C.HSE_KEY_HSE
AND C.HSE_KEY_HSE = C.HSE_KEY_HSL
AND C.HSE_KEY_HSL = C.HSE_KEY_OOR
AND C.DROP_STAT_HSE = '1'
AND C.LOB_IND_HSL = 'T'
AND C.TAP_STAT_HSL IN ('0','2')
AND C.ORD_STAT_OOR <> 'O')}

Answer 1

Hmmm....
I believe your query can be re-written as follows:
WITH Allowed_Rows (houseKey, dropStatus, ipApStat, indicator)
as (SELECT a.HSE_KEY_HSE, a.DROP_STAT_HSE,
b.TAP_STAT_HSL, b.LOB_IND_HSL
FROM OPS$SEA.HSE_BASE as a
JOIN OPS$SEA.HSL_LOB as b
ON b.HSE_KEY_HSL = a.HSE_KEY_HSE
AND b.LOB_IND_HSL IN ('I', 'C', 'T')
AND b.TAB_STAT_HSL IN ('0', '2')
JOIN OPS$SEA.OOR_Order_Open as c
ON c.HSE_KEY_OOR = a.HSE_KEY_HSE
AND c.ORD_STAT_OOR <> '0'
WHERE a.DROP_STAT_HSE = '1')
SELECT houseKey, dropStatus, ipApStat
FROM Allowed_Rows as a
WHERE a.indicator = 'I'
AND EXISTS (SELECT '1'
FROM Allowed_Rows as b
WHERE b.houseKey = a.houseKey
AND b.indicator = 'C')
AND EXISTS (SELECT '1'
FROM Allowed_Rows as b
WHERE b.houseKey = a.houseKey
AND b.indicator = 'T')
You didn't properly qualify some of your tables, and used the same alias for multiple tables (which I'm surprised didn't generate a syntax error), so I had to make my best guess as to where things actually belong. There are a couple of other variations possible, depending on the other (unlisted) requirements and constraints.
And why and how do you need to return the 'other' values of TAP_STAT_HSL? DO you need all possible combinations? The value of the row for B or C instead of A? What?