Get not selected word in column - sql-server

Question

I have this table structure and data and query that is giving me the child records. This is giving me required data as I wanted now there is another requirements that popped up with time that I want to show the name of the COA which is not selected here i.e Medical
CREATE TABLE TransactionMaster
(
ID Int,
TransactionCode VARCHAR(25),
PRIMARY KEY (ID)
)
INSERT INTO TransactionMaster VALUES (1, 'TRA-001');
INSERT INTO TransactionMaster VALUES (2, 'TRA-002');
INSERT INTO TransactionMaster VALUES (3, 'TRA-003');
CREATE TABLE TransactionDetail
(
ID Int,
MasterID Int,
COATitle VARCHAR(25),
CrAmount NUMERIC(18,2),
DrAmount NUMERIC(18,2),
PRIMARY KEY (ID),
FOREIGN KEY (MasterID) REFERENCES TransactionMaster(ID)
)
INSERT INTO TransactionDetail VALUES (1, 1, 'Medical', '2500', NULL)
INSERT INTO TransactionDetail VALUES (2, 1, 'Travelling', NULL, '2500')
INSERT INTO TransactionDetail VALUES (3, 1, 'Medicine', NULL, '2500')
INSERT INTO TransactionDetail VALUES (4, 1, 'Doc Fee', NULL, '2500')
INSERT INTO TransactionDetail VALUES (5, 2, 'Incentive', '3000', NULL)
INSERT INTO TransactionDetail VALUES (6, 2, 'Extra', NULL, '2500')
INSERT INTO TransactionDetail VALUES (7, 2, 'Bonus', NULL, '500')
INSERT INTO TransactionDetail VALUES (8, 3, 'Medical', NULL, '3000')
INSERT INTO TransactionDetail VALUES (9, 3, 'Tests', '2500', NULL)
INSERT INTO TransactionDetail VALUES (10, 3, 'Juice', '500', NULL)
Sample Query:
SELECT
m.TransactionCode,
d.COATitle,
d.CrAmount,
d.DrAmount
FROM TransactionDetail d
JOIN TransactionMaster m ON d.MasterID=m.ID
WHERE d.MasterID IN(
SELECT MasterID
FROM TransactionDetail
WHERE COATitle='Medical'
)
AND d.COATitle<>'Medical'
Output giving:
TransactionCode COATitle CrAmount DrAmount
------------------------- ------------------------- --------------------------------------- ---------------------------------------
TRA-001 Travelling NULL 2500.00
TRA-001 Medicine NULL 2500.00
TRA-001 Doc Fee NULL 2500.00
TRA-003 Tests 2500.00 NULL
TRA-003 Juice 500.00 NULL
I want to include another column that'll show Medicalin it.
Expected Output:
TransactionCode COATitle CrAmount DrAmount COA
------------------------- ------------------------- --------------------------------------- ----------------------------- ------------------------
TRA-001 Travelling NULL 2500.00 Medical
TRA-001 Medicine NULL 2500.00 Medical
TRA-001 Doc Fee NULL 2500.00 Medical
TRA-003 Tests 2500.00 NULL Medical
TRA-003 Juice 500.00 NULL Medical

Answer 1

DECLARE #prm nvarchar(100)
SET #prm = 'Medical'
SELECT
m.TransactionCode,
d.COATitle,
d.CrAmount,
d.DrAmount,
#prm as COA
FROM TransactionDetail d
JOIN TransactionMaster m ON d.MasterID=m.ID
WHERE d.MasterID IN(
SELECT MasterID
FROM TransactionDetail
WHERE COATitle=#prm
)
AND d.COATitle<>#prm