PERCENTILE_DISC selects from the supplied observations. Preserve duplicates and distinguish an observed threshold from an interpolated value.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
Data Mining: A Simple Introduction and a SQL Basket Example
Market-basket analysis turns purchases into measurable product relationships. Deduplicate products within each order, calculate support, confidence and lift in T-SQL, and interpret the counts before drawing conclusions from a small sample.
SQL SERVER – Mirrored Backup and Restore and Split File Backup – Introduction
Backup and Restore lessons from my consulting work: conventional backups, split file backups, mirrored backups and the FORMAT clause, each with an example.
DATEADD Nanoseconds: Round to datetime2 Ticks
DATEADD nanoseconds do not provide single-nanosecond storage. Test rounding thresholds with an explicit datetime2(7) input.
SQLAuthority News – Baby SQLAuthority is here!
Baby SQLAuthority is here! God has blessed Nupur and me with a healthy baby girl on September 1, 2009. Do you have a suggestion for an Indian name?
Oracle to SQL Server: Translating NVL, ROWNUM and Sequences
Translate Oracle to SQL Server expressions for NULLs, row limits, dates, sequences and concatenation, and test where they differ.
Central Management Servers and Registered Servers
Use Central Management Servers and registered servers in SSMS to organize SQL Server instances and run safe read-only queries across groups.
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.

