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Is your SQL Server running slow and you want to speed it up without sharing server credentials? In my Comprehensive Database Performance Health Check, we can work together remotely and resolve your biggest performance troublemakers in less than 4 hours.

Once you learn my business secrets, you will fix the majority of problems in the future.

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Have you ever opened any PowerPoint deck when you face SQL Server Performance Tuning emergencies? SQL Server Performance Tuning Practical Workshop is my MOST popular training with no PowerPoint presentations and 100% practical demonstrations.

Essentially I share my business secrets to optimize SQL Server performance.

For SQL Server Emergency Help, you can reach out to me at pinal@sqlauthority.com with words URGENT in the email subject line for other services mention “Comprehensive Database Performance Health Check“.

SQL SERVER – Correlated and Noncorrelated – SubQuery Introduction, Explanation and Example

Pinal Dave
SQL, SQL Server, SQL Tips and Tricks
SQL Joins, SQL Scripts, SQL Sub Query
75 Comments
A correlated subquery is an inner subquery which is referenced by the main outer query such that the inner query is considered as being executed repeatedly. Example: ----Example of Correlated Subqueries USE AdventureWorks; GO SELECT e.EmployeeID FROM HumanResources.Employee e WHERE e.ContactID IN ( SELECT c.ContactID FROM Person.Contact c WHERE MONTH(c.ModifiedDate)…
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SQLAuthority News – Interesting Read – Using A SQL JOIN In A SQL UPDATE/Delete Statement – Ben Nadel

Pinal Dave
SQL, SQL Server, SQL Tips and Tricks, SQLAuthority News
SQL Joins, SQL Scripts, SQL Stored Procedure
6 Comments
As everybody know SQL is what I like most. Before I was into SQL Server, I was very much into ColdFusion. ColdFusion is still my most favorite programming language. I still program in ColdFusion, infect my personal website https://www.pinaldave.com/ is in ColdFusion. I regularly read ColdFusion blog and latest updates…
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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 14 SQL Server database books and 94 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 an experienced and dedicated professional with a deep commitment to flawless customer service. If you need help with any SQL Server Performance Tuning Issues, please feel free to reach out at pinal@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.