Question

I’m trying to implement a LIMIT OFFSET query using MS SQL for the purpose of implementing Pagination to my products on a website together with PHP and PDO, but I get the following error: “Invalid column name”

My query

SELECT OITM.ItemCode,OITM.ItemName,ITM1.Price , 
OITM.CardCode,ROW_NUMBER() OVER (ORDER BY OITM.ItemName DESC) AS RNumber 
FROM OITM INNER JOIN OCRD ON OCRD.CardCode = OITM.CardCode 
INNER JOIN ITM1 ON OITM.ItemCode = ITM1.ItemCode 
WHERE OITM.frozenFor='N' AND PriceList=1 AND U_Publish='Y' 
AND RNumber >= 1 AND RNumber <= 2

Not to sure what is wrong here

Answer 1

You do not need a HAVING clause. You can use a cte function or a subquery. Like this:

;WITH CTE
AS
(
    SELECT OITM.ItemCode,OITM.ItemName,ITM1.Price , 
    OITM.CardCode,ROW_NUMBER() OVER (ORDER BY OITM.ItemName DESC) AS RNumber 
    FROM OITM INNER JOIN OCRD ON OCRD.CardCode = OITM.CardCode 
    INNER JOIN ITM1 ON OITM.ItemCode = ITM1.ItemCode 
    WHERE OITM.frozenFor='N' AND PriceList=1 AND U_Publish='Y' 
)
SELECT
    *
FROM
    CTE
WHERE
    RNumber >= 1 AND RNumber <= 2

Or with a subquery like this:

SELECT
    *
FROM
    (
        SELECT OITM.ItemCode,OITM.ItemName,ITM1.Price , 
        OITM.CardCode,ROW_NUMBER() OVER (ORDER BY OITM.ItemName DESC) AS RNumber 
        FROM OITM INNER JOIN OCRD ON OCRD.CardCode = OITM.CardCode 
        INNER JOIN ITM1 ON OITM.ItemCode = ITM1.ItemCode 
        WHERE OITM.frozenFor='N' AND PriceList=1 AND U_Publish='Y' 
    ) AS t
WHERE
    t.RNumber >= 1 AND t.RNumber <= 2