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Dec24

Check Constraints That Enforce Business Rules

Pinal Dave
SQL Tips and Tricks
Best Practices, SQL Constraint and Keys, SQL NULL, SQL Server
No Comments

Check constraints keep row rules inside SQL Server, but NULL behavior and trusted status determine how much protection they provide.

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Dec23

SQL SERVER – 2008 – New DataTypes DATE and TIME

Pinal Dave
SQL Tips and Tricks
SQL DateTime, SQL Scripts
10 Comments

SQL Server 2008 adds separate DATE and TIME datatypes, something DBAs wanted for years. I compare them with the SQL Server 2005 way of using DATETIME.

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Dec22

SQL SERVER – Difference Between Index Rebuild and Index Reorganize Explained with T-SQL Script

Pinal Dave
SQL Performance
SQL Index, SQL Scripts
101 Comments

Index Rebuild drops and recreates the index, while Index Reorganize reorders the leaf nodes. Rebuild above 40% fragmentation, reorganize between 10% and 40%.

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Dec21

SQL SERVER – Enabling Clustered and Non-Clustered Indexes – Interesting Fact

Pinal Dave
SQL Performance
SQL Index, SQL Scripts
10 Comments

When enabling clustered and non-clustered indexes, order matters: enabling the clustered index does not enable the others, but rebuilding all indexes does.

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Dec20

SQL SERVER – DISTINCT Keyword Usage and Common Discussion

Pinal Dave
SQL Tips and Tricks
SQL Scripts
29 Comments

Can you apply the DISTINCT keyword to only one column in a SELECT? No, it always applies to all the columns. I explain why and get the same result with GROUP BY.

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Dec19

SQL SERVER – Cumulative Update Package 5 for SQL Server 2005 Service Pack 2

Pinal Dave
SQL Tips and Tricks
SQL Download
2 Comments

Cumulative Update Package 5 for SQL Server 2005 Service Pack 2 brings the hotfixes released since SP2, up to build 3215. Download details are here.

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Dec19

Stress Testing a Query Before Release

Pinal Dave
SQL Performance
Parameter Sniffing, SQL Performance, SQL Server, SQL Wait Stats, Testing
No Comments

Stress testing a query before release reveals concurrency and parameter risks; learn to design realistic SQL Server tests and compare useful metrics.

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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 120 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.

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