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Adding running totals to a report is a common business requirement. It s also one of the few situations where declarative code often (though not always) results in poor performance. In this example, I ll use the AdventureWorks sample database to report all sales, arranged by customer, ordered by date, and with a running total of all order amounts for a customer up to and including that date. Note that the Microsoft-supplied sample database is populated with more than 31,000 orders for over 19,000 customers, and that the highest number of orders for a single customer is 28.

In current versions of SQL Server, the only way to calculate running totals in declarative code is to join each row from the table to all preceding rows for the same customer from itself, adding all those joined rows together to calculate the running total. The code for this is shown in listing 2.

tableObjectdeleteRow(index) Deletes a row The index value indicates the row index of the row to delete

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USE AdventureWorks; SET NOCOUNT ON; s.CustomerID, s.OrderDate, s.SalesOrderID, s.TotalDue, SUM(s2.TotalDue) AS RunningTotal FROM Sales.SalesOrderHeader AS s INNER JOIN Sales.SalesOrderHeader AS s2 ON s2.CustomerID = s.CustomerID AND( s2.OrderDate < s.OrderDate SalesOrderID used OR( s2.OrderDate = s.OrderDate as tie breaker AND s2.SalesOrderID <= s.SalesOrderID)) GROUP BY s.CustomerID, s.OrderDate, s.SalesOrderID, s.TotalDue ORDER BY s.CustomerID, s.OrderDate, s.SalesOrderID; SELECT

And here are the properties and methods for objects corresponding to table row objects (that is, objects corresponding to <tr> elements):

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The performance of this query depends on the average number of rows in the selfjoin. In this case, the average is less than 2, resulting in great performance: approximately 0.2 seconds on my laptop. But if you adapt the code to produce running totals per sales territory instead of per customer (by replacing all occurrences of the column name CustomerID with TerritoryID), you re in for a nasty surprise: with only 10 different territories in the database, the average number of rows in the self-join is much higher. And because performance in this case degrades exponentially, not linearly, the running time on my laptop went up to over 10 minutes (638 seconds, to be exact)!

Because the declarative running totals code usually performs poorly, this problem is commonly solved with iterative code, using a server-side cursor. Listing 3 shows the code typically used for this.

tableObjectcells(index) Returns a collection (array) of the cells in the row tableObjectrow(index) Returns the row index of the row Useful for inserting and deleting rows tableObjectinsertCell(index) Inserts a new cell and returns the inserted <td> element (which will be empty), or null for failure If index isn t supplied, then the <td> element will be inserted at the end of the row tableObjectdeleteCell(index) Deletes a cell The index value indicates the position in the cell collection to delete

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USE AdventureWorks; SET NOCOUNT ON; DECLARE @Results TABLE (CustomerID int NOT NULL, OrderDate datetime NOT NULL, SalesOrderID int NOT NULL, TotalDue money NOT NULL, RunningTotal money NULL, PRIMARY KEY (CustomerID, OrderDate, SalesOrderID));

Let s put editing tables on-the-fly to work in an example, editTablehtml This example will edit a table by adding new rows at the click of a button (and it ll work in Internet Explorer and Firefox) We start by displaying an HTML table:

INSERT INTO @Results(CustomerID, OrderDate, SalesOrderID, TotalDue) SELECT CustomerID, OrderDate, SalesOrderID, TotalDue FROM Sales.SalesOrderHeader; DECLARE @CustomerID int, @SalesOrderID int, @CurrCustomerID int, SET @CurrCustomerID = 0; SET @RunningTotal = 0; @OrderDate datetime, @TotalDue money, @RunningTotal money;

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than FAST_FORWARD DECLARE SalesCursor CURSOR STATIC READ_ONLY FOR SELECT CustomerID, OrderDate, SalesOrderID, TotalDue FROM @Results ORDER BY CustomerID, OrderDate, SalesOrderID; OPEN SalesCursor;

<body> <center> <h1> Editing HTML Tables </h1> <table id="table1" border="2"> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> </table> </center> </body>

FETCH NEXT FROM SalesCursor INTO @CustomerID, @OrderDate, @SalesOrderID, @TotalDue; WHILE @@FETCH_STATUS = 0 BEGIN; IF @CustomerID <> @CurrCustomerID BEGIN; SET @CurrCustomerID = @CustomerID; SET @RunningTotal = 0; END;

Note that we ve given an ID to the table, "table1", which will allow us to access that table in JavaScript Let s add a button with the caption Add a new row that connects to a JavaScript function named createRow:

SET @RunningTotal = @RunningTotal + @TotalDue; UPDATE @Results SET RunningTotal = @RunningTotal WHERE CustomerID = @CustomerID AND OrderDate = @OrderDate AND SalesOrderID = @SalesOrderID;

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FETCH NEXT FROM SalesCursor INTO @CustomerID, @OrderDate, @SalesOrderID, @TotalDue; END; CLOSE SalesCursor; DEALLOCATE SalesCursor; SELECT CustomerID, OrderDate, SalesOrderID, TotalDue, RunningTotal FROM @Results ORDER BY CustomerID, OrderDate, SalesOrderID;

<body> <center> <h1> Editing HTML Tables </h1> <table id="table1" border="2"> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> <tr> <td>Fe</td> <td>Fi</td> <td>Fo</td> <td>Fum</td> </tr> </table> <br> <input type="button" value="Add a new row" onclick="createRow()"> </center> </body>

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