Gianluca Sartori

Gianluca Sartori is an independent SQL Server consultant and a performance tuning specialist. He has been working in the software industry since 1999 and has been working with SQL Server ever since. Currently he is working as Senior DBA for a famous Italian Formula1 team. Besides consulting projects, he works as a SQL Server trainer and in his spare time he contributes to the SQL Server forums. He is also a speaker at several conferences in Italy and in Europe.

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Blog Post

DataMoshpit!

Today I’m presenting at DataMospit, the most metal conference in the data space! You can download the Sea of Madness bingo card from here: https://github.com/spaghettidba/CodeSamples/raw/master/SQLServerInfernals/InfernalBingo.xlsx The winner will get...

2023-09-16

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Blogs

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Question of the Day

The Range of Customers

I have this data in the OrderHeader table in a SQL Server 2025 database (ordered by CustomerID ASC): 

orderid orderdate               customerid complete
3       2025-05-10 00:00:00.0002          1
21      2024-01-10 00:00:00.0003          1
15      2023-10-28 00:00:00.0004   1
13      2025-03-08 00:00:00.0006          1
11      2024-04-02 00:00:00.0007          1
If I run this query, how many rows are returned? 
SELECT *
 from dbo.OrderHeader
 where customerid between 3 and '6'

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