SQL pivot / VLOOKUP query - sql

Question

I have the following simplified table so each stock code has
multiple warehouses and I want to "pivot" it so I can get
the cost for each warehouse just in 1 line for the stockcode
Stockcode | Warehouse | Cost
A100 WH 100$
A100 ZZ 200$
What I would like to have is the following.
So only 1 stockcode line with the warehouse costs pivoted.
Stockcode | Cost WH | Cost ZZ
A100 100$ 200$
I currently did it by exporting it to excell, creating a new sheet and add a new column to the sheet using a VLOOKUP to the main table and add the ZZ cost like that.
How would you turn this around in SQL? I am a bit stuck with understanding how to transform this tabular data in such a way.

Answer 1

Here's how to do this query using PIVOT:
select Stockcode, [WH] as CostWH, [ZZ] as CostZZ
from (
select Stockcode, Warehouse, Cost
from MyTable
) p
pivot (
MAX(Cost)
for Warehouse in ([WH], [ZZ])
) as pvt
order by Stockcode;
Test it on SQLFiddle

Answer 2

I think (Stockcode,Warehouse) is unique in your table.
And I think you can use PIVOT like it
SELECT Stockcode,[WH],[ZZ]
FROM TestData PIVOT(MAX(Cost) FOR Warehouse IN([WH],[ZZ])) p
And use dynamic query for generate query for all the warehouses
DECLARE #Warehouses varchar(500)=''
SELECT #Warehouses+=CONCAT(',[',Warehouse,']')
FROM
(
SELECT DISTINCT Warehouse
FROM TestData
) q
ORDER BY Warehouse
SET #Warehouses=STUFF(#Warehouses,1,1,'')
PRINT #Warehouses
DECLARE #query varchar(2000)=CONCAT('SELECT Stockcode,',#Warehouses,'
FROM TestData PIVOT(MAX(Cost) FOR Warehouse IN(',#Warehouses,')) p')
PRINT #query
EXEC(#query)
My another answer similar to it - Display count results of requests with results of jobs horizontally and locations vertically 3 tables

Answer 3

However, you could also do that by using simple case expression if you don't want to go pivot or dynamic pivot
SELECT
Stockcode ,
MAX( CASE (Warehouse) WHEN 'WH' THEN Cost END)[Cost WH],
MAX(CASE (Warehouse) WHEN 'ZZ' THEN Cost END) [Cost ZZ]
FROM <table> GROUP BY Stockcode
Dynamic pivot way :
DECLARE #Col nvarchar(max), #query nvarchar(max)
select #Col = STUFF(
(SELECT ',' +QUOTENAME(Warehouse) FROM <table> FOR XML PATH('')),
1, 1, ''
)
SELECT #query = N'select Stockcode, [WH] as CostWH, [ZZ] as CostZZ
from (
select Stockcode, Warehouse, Cost
from <table>) p
pivot (max(Cost) for Warehouse in ('+#Col+')
) as pvt order by Stockcode;'
exec(#query)
Result :
Stockcode Cost WH Cost ZZ
A100 100$ 200$