need to use ROW_NUMBER without over in sqlserver 2005 [duplicate]

问题

Possible Duplicate:
ROW_NUMBER() without over in SQL

I have a grid with sorting on each column and have to show only 50 rows at a time.

I am using sql server 2005 as database.

Now there is ROW_NUMBER function in sql server 2005 to filter the data with row number but Over(order by [Column]) is mandatory to use. In my case I have to sort my grid with different columns so I can not use the static columns name in order by clause. The restriction is , I have to use static query.

Can you guys help me out on this problem?

回答1:

Use several ROW_NUMBER clauses per column and choose the relevant one:

....
    ROW_NUMBER() OVER (ORDER BY [Column1]) as rn1,
    ROW_NUMBER() OVER (ORDER BY [Column2]) as rn2,
    ROW_NUMBER() OVER (ORDER BY [Column3]) as rn3,
    ROW_NUMBER() OVER (ORDER BY [Column4]) as rn4
....

OR use a CASE expression. Note: all datatypes must be compatible

ROW_NUMBER() OVER (ORDER BY CASE @sort
                     WHEN 1 THEN [Column1]
                     WHEN 1 THEN [Column2]
                     WHEN 1 THEN [Column3]
                     ...
                   END

OR If you really want an arbitrary row number then do this:

ROW_NUMBER() OVER (ORDER BY (SELECT 1)) as rn

回答2:

I found some way to do it.

SELECT
  OrderID, CustomerID, EmployeeID, OrderDate, ShippedDate,
  @Offset, @Limit, @SortColumn, @SortDirection
FROM
  Orders
WHERE
  ROW_NUMBER() OVER 
  (
    ORDER BY
      /* same expression as in the ORDER BY of the whole query */
  ) BETWEEN (@PageNum - 1) * @PageSize + 1 AND @PageNum * @PageSize 
  /* AND more conditions ... */
ORDER BY
  CASE WHEN @SortDirection = 'A' THEN
    CASE @SortColumn 
      WHEN 'OrderID'    THEN OrderID
      WHEN 'CustomerID' THEN CustomerID
      /* more... */
    END
  END,
  CASE WHEN @SortDirection = 'D' THEN
    CASE @SortColumn 
      WHEN 'OrderID'    THEN OrderID
      WHEN 'CustomerID' THEN CustomerID
      /* more... */
    END 
  END DESC

来源：https://stackoverflow.com/questions/12914888/need-to-use-row-number-without-over-in-sqlserver-2005

标签

sql-server-2005