How to coalesce into multiple columns with grouping? - sql-server

Question

If you run the below code you will get a result that looks like the following:
ITEM DIFF_QTY DATE_OUTGO WAREH COMPANY
1000 -5, -3, -4, 2017-08-01, 2017-08-02, 2017-08-03, WH CMP
Which is great, this is the output that I am looking for. Sadly this only works when a specific ITEM is selected. If I remove the WHERE then everything is put on the same row of output.
So how would I separate the results by grouping (ITEM, WAREH, COMPANY)? So that the end result would look like this:
ITEM DIFF_QTY DATE_OUTGO WAREH COMPANY
1000 -5, -3, -4, 2017-08-01, 2017-08-02, 2017-08-03, WH CMP
1001 -10, -13 2017-08-01, 2017-08-03 WH CMP
Code
DECLARE #tempTable TABLE (
ITEM nvarchar(32),
DIFF_QTY nvarchar(6),
DATE_OUTGO nvarchar(10),
WAREH nvarchar(5),
COMPANY nvarchar(5)
)
INSERT INTO #tempTable (ITEM, DIFF_QTY, DATE_OUTGO, WAREH, COMPANY)
VALUES
(1000, '-5', '2017-08-01', 'WH', 'CMP'),
(1000, '-3', '2017-08-02', 'WH', 'CMP'),
(1000, '-4', '2017-08-03', 'WH', 'CMP'),
(1001, '-10', '2017-08-01', 'WH', 'CMP'),
(1001, '-13', '2017-08-03', 'WH', 'CMP')
SELECT *
FROM #tempTable
DECLARE #itemNum nvarchar(32)
DECLARE #diffQty nvarchar(max)
DECLARE #dateOutgo nvarchar(max)
DECLARE #warehouse nvarchar(5)
DECLARE #company nvarchar(5)
SET #diffQty = ''
SET #dateOutgo = ''
SELECT
#itemNum = ITEM,
#diffQty = #diffQTY + DIFF_QTY + ', ',
#dateOutgo = #dateOutgo + DATE_OUTGO + ', ',
#warehouse = WAREH,
#company = COMPANY
FROM
#tempTable
WHERE
ITEM = 1000
SELECT #itemNum ITEM_NUM, #diffQty DIFF_QTY, #dateOutgo DATE_OUTGO, #warehouse WAREHOUSE, #company COMPANY
I've looked at multiple threads about coalesce but pretty much every solution requires that you don't do multiple things at the same time (SELECT, GROUP, COALESCE, Multiple columns etc...)

Answer 1

You cannot use scalar variables, like #itemNum nvarchar(32), to store tabular data.
The output you want to achieve is most commonly generated in SQL Server using FOR XML PATH:
SELECT t.ITEM,
STUFF((SELECT ',' + x.DIFF_QTY
FROM #tempTable AS x
WHERE x.ITEM = t.ITEM AND
x.WAREH = t.WAREH AND
x.COMPANY = t.COMPANY
FOR XML PATH('')), 1, 1, '') AS DIFF_QTY,
STUFF((SELECT ',' + x.DATE_OUTGO
FROM #tempTable AS x
WHERE x.ITEM = t.ITEM AND
x.WAREH = t.WAREH AND
x.COMPANY = t.COMPANY
FOR XML PATH('')), 1, 1, '') AS DATE_OUTGO
FROM #tempTable AS t
GROUP BY t.ITEM, t.WAREH, t.COMPANY
Output:
ITEM DIFF_QTY DATE_OUTGO
-----------------------------------------------------
1000 -5,-3,-4 2017-08-01,2017-08-02,2017-08-03
1001 -10,-13 2017-08-01,2017-08-03

Answer 2

You can use FOR XML PATH('') to concatenate the values:
SELECT
t1.ITEM,
a.DIFF_QTY,
b.DATE_OUTGO,
t1.WAREH,
t1.COMPANY
FROM #tempTable t1
CROSS APPLY(
SELECT DIFF_QTY = STUFF((
SELECT ', ' + CAST(t2.DIFF_QTY AS VARCHAR(100))
FROM #tempTable t2
WHERE
t2.ITEM = t1.ITEM
AND t2.WAREH = t1.WAREH
AND t2.COMPANY = t2.COMPANY
ORDER BY t2.DATE_OUTGO
FOR XML PATH('')
), 1, 1, '')
) a
CROSS APPLY(
SELECT DATE_OUTGO = STUFF((
SELECT ', ' + CAST(t2.DATE_OUTGO AS VARCHAR(10))
FROM #tempTable t2
WHERE
t2.ITEM = t1.ITEM
AND t2.WAREH = t1.WAREH
AND t2.COMPANY = t2.COMPANY
ORDER BY t2.DATE_OUTGO
FOR XML PATH('')
), 1, 1, '')
) b
GROUP BY
t1.ITEM, t1.WAREH, t1.COMPANY, a.DIFF_QTY, b.DATE_OUTGO

Answer 3

DECLARE #tempTable TABLE (
ITEM nvarchar(32),
DIFF_QTY nvarchar(6),
DATE_OUTGO nvarchar(10),
WAREH nvarchar(5),
COMPANY nvarchar(5)
)
INSERT INTO #tempTable (ITEM, DIFF_QTY, DATE_OUTGO, WAREH, COMPANY)
VALUES
(1000, '-5', '2017-08-01', 'WH', 'CMP'),
(1000, '-3', '2017-08-02', 'WH', 'CMP'),
(1000, '-4', '2017-08-03', 'WH', 'CMP'),
(1001, '-10', '2017-08-01', 'WH', 'CMP'),
(1001, '-13', '2017-08-03', 'WH', 'CMP')
SELECT *
FROM #tempTable
DECLARE #itemNum nvarchar(32)
DECLARE #diffQty nvarchar(max)
DECLARE #dateOutgo nvarchar(max)
DECLARE #warehouse nvarchar(5)
DECLARE #company nvarchar(5)
SET #diffQty = ''
SET #dateOutgo = ''
SELECT distinct ITEM ,
STUFF((SELECT ', ' + CAST(DIFF_QTY AS NVARCHAR(MAX)) [text()]
FROM #tempTable temp
where t.ITEM=temp.ITEM
FOR XML PATH(''), TYPE)
.value('.','NVARCHAR(MAX)'),1,2,'') DIFF_QTY,
STUFF((SELECT ', ' + CAST(DATE_OUTGO AS NVARCHAR(MAX)) [text()]
FROM #tempTable temp
where t.ITEM=temp.ITEM
FOR XML PATH(''), TYPE)
.value('.','NVARCHAR(MAX)'),1,2,'') DATE_OUTGO,
WAREH,COMPANY
from #tempTable t
Hope it works exactly you want