Read more...

We asked Phil Factor to write a nice simple quick-start guide about aggregation, pivoting and un-pivoting techniques. To do so, he takes us all the way from getting the data from a published source, transferring it to SQL Server, un-pivoting it, storing it in a relational table, aggregating it and finally pivoting the data in a variety of ways.  Read more...

1100 largest indexes by total buffer cache usage; 100 largest tables by total reserved pages; Largest tables in each database with running total of space usage and growth since last snapshot  Read more...

SQL Server database engine doesn't have a MEDIAN() aggregate function. This is probably because there are several types of median, such as statistical, financial or vector medians. Calculating Medians are essentially a row-positioning task, since medians are the middle value of an ordered result. Easy to do in SQL? Nope. Joe Celko explains why.  Read more...

Read more...

Read more...

Learn how to summarize the values of your data using aggregate functions such as COUNT(), SUM(), and AVG() from MVP Kathi Kellenberger. Grouping and aggregate filters are covered as well.  Read more...

In our application we have the need to perform mathematical calculations. Right now we are doing so in our front end application. Unfortunately we are starting to experience performance problems with large data sets and differences in calculations due to developers using different logic. We are seeking some other options to perform the calculations. Does SQL Server perform basic mathematical calculations?  Read more...

Read more...

Every now and then you may attempt to calculate an aggregate function -- such as SUM() -- on a correlated subquery, only to encounter the following error:  Read more...