SQL to convert distinct item in row to column - sql

Question

I have a table as
Date Item Quantity
20170101 Mango 5
20170101 Orange 6
20170102 Mango 7
20170102 Orange 8
I want below output
Date Mango Orange
20170101 5 6
20170102 7 8
for this i used below sql query
SELECT
Date,
SUM(case when Item='Mango' then Quantity else 0 end) AS Mango,
SUM(case when Item='Orange' then Quantity else 0 end) AS Orange
FROM orderTable
GROUP BY date
but this is kind of hard coding for Mango and Orange. What if I need new item in orderTable. Can any one suggest me how can I make this query dynamic. So that if I add new item it automatically create new coulmn having item name as name and it will have 0 value under column against date when order not placed for that item.
like
Date Item Quantity
20170101 Mango 5
20170101 Orange 6
20170102 Mango 7
20170102 Orange 8
20170102 Cherry 9
then output should be as ...
Date Mango Orange Cherry
20170101 5 6 0
20170102 7 8 9

Answer 1

IF OBJECT_ID('Test') IS NOt NUll
DROP TABLE Test
CREATE TABLE Test
(
Date VARCHAR(100),
Item VARCHAR(100),
Quantity INT
)
INSERT Test VALUES
('20170101', 'Mango', 5),
('20170101', 'Orange', 6),
('20170102', 'Mango', 7),
('20170102', 'Orange', 8),
('20170102', 'Cherry', 9)
DECLARE #SQL AS VARCHAR(MAX)
DECLARE #Columns AS VARCHAR(MAX)
DECLARE #Columns2 AS VARCHAR(MAX)
SELECT #Columns = COALESCE(#Columns + ',','') + QUOTENAME(Item)
FROM (SELECT DISTINCT Item FROM Test) AS B
ORDER BY B.Item
SELECT #Columns2 = COALESCE(#Columns2 + ',','') + 'ISNULL(' + QUOTENAME(Item) + ', 0) AS ' + Item
FROM (SELECT DISTINCT Item FROM Test) AS B
ORDER BY B.Item
SET #SQL = '
WITH PivotData AS
(
SELECT Date, Item, Quantity FROM Test
)
SELECT
Date, ' + #Columns2 + '
FROM PivotData
PIVOT
(
SUM(Quantity)
FOR Item
IN (' + #Columns + ')
) AS PivotResult
ORDER BY Date'
EXEC(#SQL);
DROP TABLE Test
Result:
Date Cherry Mango Orange
20170101 0 5 6
20170102 9 7 8
Reference (code pic not shown but you can access it if you view source the page) :
http://sqlmag.com/t-sql/pivoting-dynamic-way

Answer 2

IF OBJECT_ID('Tempdb..#Temp') IS NOt NUll
Drop Table #Temp
;With cte([Date] ,Item ,Quantity)
AS
(
SELECT '20170101','Mango' ,5 Union all
SELECT '20170101','Orange' ,6 Union all
SELECT '20170102','Mango' ,7 Union all
SELECT '20170102','Orange' ,8 Union all
SELECT '20170102','Cherry' ,9
)
SELECT * INTO #Temp FROM cte
DECLARE #dynamicCol nvarchar(max),
#Sql nvarchar(max),
#dynamicCol2 nvarchar(max)
SELECT #dynamicCol=STUFF((SELECT DISTINCT ', ' + 'ISNULL('+Item +',''0'') AS '+ Item FROM #Temp
FOR XML PATH('')),1,1,'')
SELECT #dynamicCol2=STUFF((SELECT DISTINCT ', ' + Item FROM #Temp
FOR XML PATH('')),1,1,'')
SET #Sql='
SELECT [Date] , '+ #dynamicCol +' From
(
SELECT [Date] ,Item ,Quantity From
#temp
)AS Src
PIVOT
(
MAX([Quantity]) For [Item ] IN ('+#dynamicCol2+')
)
AS Pvt
'
PRINT #Sql
EXEC(#Sql)
OutPut
Date Cherry Mango Orange
----------------------------------
20170101 0 5 6
20170102 9 7 8

Answer 3

DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
select #cols = STUFF((SELECT distinct ',' + QUOTENAME(c.Item)
FROM dbo.OrderTable c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT DateOrdered, ' + #cols + ' from
(
select Item, DateOrdered, Quantity
from dbo.OrderTable
) x
pivot
(
Sum(Quantity)
for Item in (' + #cols + ')
) p '
execute(#query)
If you do this it will give you result that you want

Answer 4

Try this :
CREATE TABLE [dbo].[test](
[Date] [int] NULL,
[Item] [nvarchar](50) NULL,
[Quantity] [int] NULL
) ON [PRIMARY]
GO
INSERT [dbo].[test] ([Date], [Item], [Quantity]) VALUES (20170101, N'Mango', 5)
GO
INSERT [dbo].[test] ([Date], [Item], [Quantity]) VALUES (20170101, N'Orange', 6)
GO
INSERT [dbo].[test] ([Date], [Item], [Quantity]) VALUES (20170102, N'Mango', 7)
GO
INSERT [dbo].[test] ([Date], [Item], [Quantity]) VALUES (20170102, N'Orange', 8)
GO
INSERT [dbo].[test] ([Date], [Item], [Quantity]) VALUES (20170102, N'Cherry', 5)
GO
INSERT [dbo].[test] ([Date], [Item], [Quantity]) VALUES (20170103, N'Cherry', 2)
GO
dynamic sql :
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(Item)
from test
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = N'SELECT DATE, ' + #cols + N' from
(
select Date,Item, Quantity from test
) x
pivot
(
max(Quantity)
for Item in (' + #cols + N')
) p '
exec sp_executesql #query;
result :
DATE Cherry Mango Orange
20170101 NULL 5 6
20170102 5 7 8
20170103 2 NULL NULL