data-konzept

'The script first creates the “RunningTotals” database. Notice that you first need to create the “C:\RunningTotals” folder, because this is where SQL Server will try to store the database files. Alternatively, you can modify the CREATE DATABASE statement in the script to store the files in a different folder. Then the script creates the “Billing.Transactions” table, and populates it with test data. The table includes the “Balance” column, which is set to NULL before each method is being used. The goal is to populate the “Balance” column with the balance in each account after each transaction.

Here are the methods that I demonstrate in the script in descending order of execution time:

 1. Cursor with an UPDATE statement in each iteration

 2. Cursor with a temporary table and an INSERT statement in each iteration

 3. Correlated sub-query

 4. Window Function – SUM () OVER…

 5. In-place UPDATE with ORDER BY

 6. In-place UPDATE with an index hint'...

http://www.madeiradata.com/calculate-running-totals-sql-server/?utm_source=DBW&utm_medium=pubemail