Avoid repeated values in a join - sql

Question

I have two tables - a header and a matrix/details.
*Header Table* *Matrix / Details Table*
+----+--------+-----+ +----+--------+------+
| ID | Parent | Qty | | ID | Child | Qty |
+----+--------+-----+ +----+--------+------+
| 1 | A | 10 | | 1 | X | 100 |
| 2 | B | 20 | | 1 | Y | 1000 |
| 3 | C | 30 | | 2 | X | 200 |
+----+--------+-----+ | 2 | Y | 2000 |
| 3 | X | 30 |
| 3 | Y | 300 |
| 3 | Z | 3000 |
+----+--------+------+
I'm Joining these two tables based on ID.
I don't want the result to have duplicated values from header table.
I expect a result like following:
*Current Result* *Expected Result*
+----+--------+-----+-------+------+ +----+--------+-----+-------+------+
| ID | Parent | Qty | Child | Qty | | ID | Parent | Qty | Child | Qty |
+----+--------+-----+-------+------+ +----+--------+-----+-------+------+
| 1 | A | 10 | X | 100 | | 1 | A | 10 | X | 100 |
| 1 | A | 10 | Y | 1000 | | | | | Y | 1000 |
| 2 | B | 20 | X | 200 | | 2 | B | 20 | X | 200 |
| 2 | B | 20 | Y | 2000 | | | | | Y | 2000 |
| 3 | C | 30 | X | 30 | | 3 | C | 30 | X | 30 |
| 3 | C | 30 | Y | 300 | | | | | Y | 300 |
| 3 | C | 30 | Z | 3000 | | | | | Z | 3000 |
+----+--------+-----+-------+------+ +----+--------+-----+-------+------+
Is this possible? If not any, alternate solution available?
Thanks in advance...

Answer 1

If you are using SQL Server,Try with the below query.
;WITH CTE_1
AS
(SELECT *,ROW_NUMBER()OVER(PARTITION BY ID,Parent,Quantity ORDER BY ID ) RNO
FROM Header H
JOIN [Matrix / Details] M
ON H.ID=M.ID)
SELECT CASE WHEN RNO=1 THEN CAST(ID as VARCHAR(50)) ELSE '' END ID,
CASE WHEN RNO=1 THEN Parent ELSE '' END Parent,
CASE WHEN RNO=1 THEN cast(Quantity as VARCHAR(50)) ELSE '' END Quantity,
Child,Qty
FROM CTE_1
ORDER BY ID,Parent,Quantity