SQL Case Reference - sql

Question

Using the code below (thank you #BHouse), I am attempting to adjust "ECOMMERCE" selling price to reflect "ENFIELD" selling price. As you can see from results, I am getting multiple entries.
Results can been seen here
SELECT
T1.STRTRADECODE AS [STORE],
T1.LINTITEMNUMBER AS [SKU],
CASE WHEN T1.STRTRADECODE = 'ECOMMERCE' THEN T2.CURNORMALSELL ELSE T1.CURNORMALSELL END AS [SELLINGPRICE]
FROM DAILYSALES T1
LEFT JOIN DAILYSALES T2 ON T1.LINTITEMNUMBER = T2.LINTITEMNUMBER AND T1.STRTRADECODE <> T2.STRTRADECODE
WHERE
T1.DTMTRADEDATE >= '2018-01-02 00:00:00'
AND T1.STRSALETYPE = 'I'
AND T1.STRTRADECODE IN ('ECOMMERCE', 'ENFIELD')
AND T1.LINTITEMNUMBER = '18760'
GROUP BY
T1.STRTRADECODE,
T1.LINTITEMNUMBER,
T1.CURNORMALSELL,
T2.CURNORMALSELL
ORDER BY
T1.STRTRADECODE DESC
Any help will be much appreciated.

Answer 1

Added Sku to the table , matching Sku and different store numbers will retrieve selling value for store2.
This query will help u, to use values matching another store
SELECT T1.STRTRADECODE AS [STORE], T1.LINTITEMNUMBER AS [SKU], T2.CURNORMALSELL AS [SELLINGPRICE]
FROM DAILYSALES T1
INNER JOIN (
SELECT *
FROM DAILYSALES
WHERE name = 'enfield'
) t2
ON t1.sku = t2.sku
WHERE T1.DTMTRADEDATE >= '2018-01-02 00:00:00' AND T1.STRSALETYPE = 'I' AND T1.STRTRADECODE IN (
'ECOMMERCE'
,'ENFIELD'
) AND T1.LINTITEMNUMBER = '18760'
ORDER BY T1.STRTRADECODE DESC
sample:
DECLARE #testtable TABLE (id INT identity(1, 1), name VARCHAR(100), sellingPrice FLOAT, sku BIGINT)
INSERT INTO #testtable (name, sellingPrice, sku)
SELECT 'Enfield', '60.50', '16043853021'
UNION
SELECT 'Ecommerce', '190.50', '16043853021'
UNION
SELECT 'Enfield', '120.45', '06062829018'
UNION
SELECT 'Ecommerce', '180.45', '06062829018'
;
select distinct t.id,t.name,t.sku,t2.sellingPrice
from #testtable t Inner join (select * from #testtable where name = 'enfield') t2
on t.sku = t2.sku