Question

I used ROW_NUM() function for paging in ASP.NET

SELECT row_num, expense_id,email, reason, amount,date,category_name,is_income
FROM
  (
  SELECT e.expense_id,e.email, e.reason, e.amount,e.date,c.category_name,e.is_income, 
  ROW_NUMBER() OVER(ORDER BY e.date DESC,e.expense_id) as row_num
  FROM Expense e
  JOIN Category c ON e.category_id = c.category_id
  WHERE e.date >='5-1-2011' AND e.date<='5-31-2011'
  ) as ExpenseInfo
WHERE email='[e-mail]'

But it returned an inconsistent list of row_num (such as 1,3,4… or 2,3,4…). How can I solve this problem?

Thanks in advance.

I have solved my problem

SELECT RowNum, expense_id, email, reason, amount, date, category_name, is_income
FROM
(
SELECT e.expense_id, e.email, e.reason, e.amount, e.date, c.category_name, e.is_income, Row_Number() OVER(ORDER BY date DESC) as row_num 
FROM Expense e JOIN Category c 
  ON e.category_id = c.category_id
WHERE e.date >='5-1-2011' AND e.date<='5-31-2011' AND e.email='[e-mail]'
) AS ExpenseInfo
WHERE row_num>=1 and row_num<=20

Answer 1

The Where email = '[e-mail]' is filtering out certain rows. For what you are doing here, you don’t need the “outer” query. Just wrap it all together.

 SELECT ROW_NUMBER() OVER(ORDER BY e.date DESC, e.expense_id) as row_num
       , e.expense_id
       , e.email
       , e.reason
       , e.amount
       , e.date
       , c.category_name
       , e.is_income
  FROM Expense e
  JOIN Category c 
    ON e.category_id = c.category_id
  WHERE e.date >='5-1-2011' 
    AND e.date <='5-31-2011'
    AND e.email = '[e-mail]'