All material items are combined to a single material sequence - sql

Question

I have a table as follows:
Header Number, Operation_Seq_Number, Material_Seq_Number, Material_item_id
I need to implement the following functionality.
Within the same Operation Sequence, the Item is used multiple times with different material sequences. I need to convert this so that all material items are combined to a single material sequence within the Operation Sequence.
So the need is to add the quantities of material sequence 114, 115, 116, 117 together and use for 114. The rows for 115 and 116, 117 should not exist.
I have tried to implement SQL for this, but I have failed thus far and I am looking for help to do this.
SELECT
HEADER_NUMBER,
WO_OPERATION_SEQ_NUMBER,
MATERIAL_SEQ_NUMBER,
MATERIAL_ITEM_NUMBER,
MATERIAL_QUANTITYs
FROM xx
GROUP BY MATERIAL_ITEM_NUMBER
ORDER BY MATERIAL_SEQ_NUMBER ASC
This is far from what I need. Looking for help please.

Answer 1

Here's my take on it. The code is commented so you see what I'm trying to do.
CREATE TABLE test (
HEADER_NUMBER nvarchar(50)
, WO_OPERATION_SEQ_NUMBER int
, MATERIAL_SEQ_NUMBER int
, MATERIAL_ITEM_NUMBER nvarchar(50)
, MATERIAL_QUANTITY int
);
INSERT INTO test (HEADER_NUMBER, WO_OPERATION_SEQ_NUMBER, MATERIAL_SEQ_NUMBER, MATERIAL_ITEM_NUMBER, MATERIAL_QUANTITY)
VALUES
('W001446666',10,114,'236328-01-1',100)
, ('W001446666',10,115,'236328-01-3',1000)
, ('W001446666',10,116,'236328-01-2',200)
, ('W001446666',10,117,'98751-04',2410)
;
--The CTE prepares the data by selecting only the distinct columns
--so that our main SELECT will start out with a distinct row for each HEADER/WO_OPs...SEQ_NUM
WITH tMod as (
SELECT
t.HEADER_NUMBER
, t.WO_OPERATION_SEQ_NUMBER
, MIN(t.MATERIAL_SEQ_NUMBER) as MATERIAL_SEQ_NUMBER_MIN
--Remove if not needed. Here we show all the MATERIAL ITEM NUMBERS
--in a single column if you need them.
, STUFF((
SELECT ',' + t2.MATERIAL_ITEM_NUMBER
FROM test as t2
ORDER BY t2.MATERIAL_SEQ_NUMBER
FOR XML PATH('')
),1,1,'') as MATERIAL_ITEM_NUMBERS
FROM test as t
GROUP BY
t.HEADER_NUMBER
, t.WO_OPERATION_SEQ_NUMBER
)
SELECT
tm.*
, qtys.MATERIAL_QUANTITY
--First get the distinct rows from the tMod CTE
FROM tMod as tm
--Now join to a derived table where are only calculating the SUM
LEFT OUTER JOIN (
SELECT
t.HEADER_NUMBER
, t.WO_OPERATION_SEQ_NUMBER
, SUM(t.MATERIAL_QUANTITY) as MATERIAL_QUANTITY
FROM test as t
GROUP BY t.HEADER_NUMBER, t.WO_OPERATION_SEQ_NUMBER
) as qtys
ON qtys.HEADER_NUMBER = tm.HEADER_NUMBER
AND qtys.WO_OPERATION_SEQ_NUMBER = tm.WO_OPERATION_SEQ_NUMBER
;
HEADER_NUMBER
WO_OPERATION_SEQ_NUMBER
MATERIAL_SEQ_NUMBER_MIN
MATERIAL_ITEM_NUMBERS
MATERIAL_QUANTITY
W001446666
10
114
236328-01-1,236328-01-3,236328-01-2,98751-04
3710
fiddle