Inner join gives undesired result with row number in sql server - sql

Question

I've tried to do a pagination on data in using ROW_NUMBER()
Here is my query:
SELECT * FROM
(SELECT ROW_NUMBER() OVER (ORDER BY OrderID) AS Row,* FROM SpecificOrders)
AS EMP
inner join Users as c on EMP.UserID = c.UserID
inner join Users as u on EMP.CreatedBy = u.UserID
inner join SpecificOrderPayment as p on EMP.OrderID= p.OrderID
WHERE Row BETWEEN 0 AND 10
When I execute this query, I get output like following with :
Row | OrderID | UserID |
1 | | |
5 | | |
6 | | |
7 | | |
8 | | |
9 | | |
10 | | |
If I remove this WHERE Row BETWEEN 0 AND 10 condition then it'll gives me all records
Here my question is why I get only 7 rows and why here 2,3 and 4 is missing in the row column.
Moreover, If i remove 3rd join query (SpecificOrderPayment)then it will give me proper result.

Answer 1

you've got OrderID that are null or blanks in SpecificOrders and they are sorting to the top - the approach isn't wrong otherwise, although there are other ways of doing it such as TOP 10..etc
SELECT * FROM
(SELECT ROW_NUMBER() OVER (ORDER BY OrderID) AS Row,* FROM SpecificOrders
WHERE RTRIM(COALESCE(OrderID, '')) <> '')
AS EMP
inner join Users as c on EMP.UserID = c.UserID
inner join Users as u on EMP.CreatedBy = u.UserID
inner join SpecificOrderPayment as p on EMP.OrderID= p.OrderID
WHERE Row BETWEEN 0 AND 10

Answer 2

The problem is that you are numbering the rows of SpecificOrders and not of final result.
In your case you only have one row per order, so using left joins should solve the issue
But, if the inner query could return multiple rows for each OrderID you will see the same row number many times
And if the join (inner) will filter some row you will not get that row number in result.
You have simply to separate the query for data extraction from the query for pagination,
Try this:
SELECT *
FROM (
SELECT ROW_NUMBER() OVER (ORDER BY EMP.OrderID) AS Row, EMP.*
FROM SpecificOrders AS EMP
left join Users as c on EMP.UserID = c.UserID
left join Users as u on EMP.CreatedBy = u.UserID
left join SpecificOrderPayment as p on EMP.OrderID= p.OrderID
) D
WHERE [Row] BETWEEN 0 AND 10