April 2006
Intermediate to advanced
640 pages
16h 46m
English
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Running Aggregations
Running aggregations are aggregations of data over a sequence (typically temporal). There are many variations of running aggregate problems, and I’ll describe several important ones here.
In my examples, I’ll use a summary table called EmpOrders that contains one row for each employee and month, with the total quantity of orders made by that employee in that month. Run the code in Example 6-1 to create the EmpOrders table, and populate the table with sample data.
Example 6-1. Creating and populating the EmpOrders table
USE tempdb; GO IF OBJECT_ID('dbo.EmpOrders') IS NOT NULL DROP TABLE dbo.EmpOrders; GO CREATE TABLE dbo.EmpOrders ( empid INT NOT NULL, ordmonth DATETIME NOT NULL, qty INT NOT NULL, PRIMARY KEY(empid, ordmonth) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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