How can I spilt a varchar column to different columns - sql

Question

I have a database table that holds userspecified data for customer orders.
instead of making a column per custom field the wrighter of the software made a 3 column system like this:
orderline_ID Field_ID Value
--------------------------------
1 1 50
1 2 today
1 3 green
2 1 80
2 2 next week
2 3 60
I want this data sorted like this:
Orderline_ID 1 2 3
----------------------------------------
1 50 today green
2 80 next week 60
so I can join it in an other query I use.
But the code I wrote came up like
Orderline_ID 1 2 3
-----------------------------------------
1 50 NULL NULL
1 NULL today NULL
1 NULL NULL green
2 80 NULL NULL
2 NULL next week NULL
2 NULL NULL 60
and when I sort by Orderline_ID it results in a error.
The code I used:
SELECT
fldVerkoopOrderRegelID,
(SELECT VOG.fldWaarde
WHERE (VOG.fldVeldNummer = 1) AND (VOG.fldWaarde IS NOT NULL)) AS [aantal vaten],
(SELECT VOG.fldWaarde
WHERE (VOG.fldVeldNummer = 2) AND (VOG.fldWaarde IS NOT NULL)) AS [Vat nett0],
(SELECT VOG.fldWaarde
WHERE (VOG.fldVeldNummer = 3) AND (VOG.fldWaarde IS NOT NULL)) AS [Vat bruto],
(SELECT VOG.fldWaarde
WHERE (VOG.fldVeldNummer = 4) AND (VOG.fldWaarde IS NOT NULL)) AS [cust product code],
(SELECT VOG.fldWaarde
WHERE (VOG.fldVeldNummer = 5) AND (VOG.fldWaarde IS NOT NULL)) AS [extra text],
(SELECT VOG.fldWaarde
WHERE (VOG.fldVeldNummer = 6) AND (VOG.fldWaarde IS NOT NULL)) AS [HS code]
FROM
dbo.tblVerkoopOrderIngaveGegeven AS VOG
WHERE
(fldVerkoopOrderRegelID IS NOT NULL)

Answer 1

this achievable using left join.
select t1.orderline_id, t1.Value, t2.Value, t3.Value
from tblVerkoopOrderIngaveGegeven t1
left join tblVerkoopOrderIngaveGegeven t2 on t2.orderline_id = t1.orderline_id and t2.field_id = 2
left join tblVerkoopOrderIngaveGegeven t3 on t3.orderline_id = t1.orderline_id and t3.field_id = 3
where t1.field_id = 1

Answer 2

You can select distinct a unique order ids and then do a left join on three tables that each has the column you need i.e. 1,2,3
DECLARE #Orders TABLE (
[Orderline_ID] INT,
[Field_ID] INT,
[Value] VARCHAR(MAX)
)
INSERT INTO #Orders SELECT 1, 1, '50'
INSERT INTO #Orders SELECT 1, 2, 'today'
INSERT INTO #Orders SELECT 1, 3, 'green'
INSERT INTO #Orders SELECT 2, 1, '80'
INSERT INTO #Orders SELECT 2, 2, 'next week'
INSERT INTO #Orders SELECT 2, 3, '60'
SELECT
[T].[Orderline_ID],
[T1].[C1],
[T2].[C2],
[T3].[C3]
FROM
(SELECT DISTINCT [Orderline_ID] FROM #Orders ) AS [T]
LEFT JOIN (SELECT [Orderline_ID], [Field_ID], [Value] AS [C1] FROM #Orders) AS [T1] ON ([T].[Orderline_ID] = [T1].[Orderline_ID] AND [T1].[Field_ID] = 1)
LEFT JOIN (SELECT [Orderline_ID], [Field_ID], [Value] AS [C2] FROM #Orders) AS [T2] ON ([T].[Orderline_ID] = [T2].[Orderline_ID] AND [T2].[Field_ID] = 2)
LEFT JOIN (SELECT [Orderline_ID], [Field_ID], [Value] AS [C3] FROM #Orders) AS [T3] ON ([T].[Orderline_ID] = [T3].[Orderline_ID] AND [T3].[Field_ID] = 3)

Answer 3

Using PIVOT is also a way to achieve this.
SELECT orderline_ID,
[1] AS [total barrels],
[2] AS [vat netto],
[3] AS [vat bruto]
FROM
(
SELECT orderline_ID, Field_ID, [Value]
FROM YourSaleOrderInputDataTable
WHERE Field_ID IN (1, 2, 3) -- optional criteria
) AS src
PIVOT
(
MAX([Value])
FOR Field_ID IN ([1], [2], [3])
) AS pvt
ORDER BY orderline_ID;