SELECT SUM over a lone NULL throws Msg 8117: Operand data type void type is invalid for sum operator. Here is why it happens and how ISNULL fixes it.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
SQL SERVER – T-SQL Scripts to Find Maximum between Two Numbers
A SQL enthusiast at the airport asked for a simple way to find maximum between two numbers. Here is his clever ABS formula and my CASE version.
Tabular Models for the SQL Developer
Tabular models for the SQL developer add relationships, measures, security, and reusable semantics above SQL tables; learn when a view is enough.
Summary Tables: Keeping Pre-Aggregated Totals Current
Keep summary tables current with changed-day rebuilds, handle late arrivals and deletes, and reconcile stored totals against detail.
SQLAuthority News – Ahmedabad Tech Ed On Road June 11, 2011 – A Grand Success of Community Tech Days
Over 500 people packed the Ahmedabad Tech Ed On Road on June 11, 2011, so we found 150 more chairs. Here is how this Community Tech Days went.
SQL SERVER – SSAS – Multidimensional Space Terms and Explanation
At a Tech Ed On Road session I was asked to explain multidimensional space in simple words. Here are dimension, member, value, attribute and size.
Data Integration Patterns Without Special Tools
Data integration patterns in SQL Server cover full reloads, incremental pulls, change capture, and file drops with clear restart rules.
SQL Server slow? Let's fix it together in about four hours.
In my Comprehensive Database Performance Health Check, you share your screen, I guide you, and we fix your biggest performance troublemakers. No passwords. No remote access.
You keep every script, and the know-how to fix it yourself next time.
Want your whole team to learn it?
My Practical Workshop has no PowerPoint, just live demos. My AI Enablement Workshop shows your team where AI saves hours, and where it quietly costs them.
Over 400 customers have worked with me this way, and not one shared a password. See all consulting options.
Who We Are
Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 24 years of hands-on experience. He holds a Masters of Science degree and numerous database certifications.
Pinal has authored 19 books and 125 Pluralsight courses. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,800 database tech articles on his blog at https://blog.sqlauthority.com.
Pinal is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2).
Nupur Dave is a social media enthusiast and an independent consultant. She primarily focuses on the database domain, helping clients build short and long-term multi-channel campaigns to drive leads for their sales pipeline.
Shaivi Pinalkumar Dave is a book author and a women’s artistic gymnast.

