Celko's Summer SQL Stumpers: Prime numbers
Our first Stumper sees Joe Celko providing a conundrum with a prize for anyone who can come up with a better solution than he can.
2009-07-27
3,211 reads
T-SQL
T-SQL Best Practices
This article, the first in a series, discusses T-SQL coding best practices. Join Greg Larsen as he explains how to write queries to optimize SQL Server resources and improve performance.
2009-07-24
8,966 reads
2009-07-22
4,137 reads
Intersect, Except, Union, All and Any
Longtime author and expert DBA David Poole examines a few T-SQL commands that he has never used. Learn how some of these little used T-SQL items function and see if they work for you.
2011-12-23 (first published: 2009-07-20)
40,519 reads
2009-07-17
4,459 reads
Top five tips for SQL Server developers
Check out these handy database development best practices, with tips on dealing with batch updates, stored procedures and more.
2009-07-14
7,765 reads
2009-07-10
4,643 reads
2009-07-09
4,596 reads
10+ tips for working smarter with SQL
The sharper your SQL skills become, the more robust and error-free your solutions will be. Here are a dozen practical tips to get you started
2009-07-07
7,621 reads
Limit Groups by Number Using Transact-SQL or MS Access
You can easily limit or group a recordset, but doing both to the same recordset takes a bit of hand coding. Find out how both SQL Server and MS Access can handle the task.
2009-07-07
2,354 reads
Blogs
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Question of the Day
Checking Identities
The DBCC CHECKIDENT command is used when working with identity values. I have a table with 10 rows in it that looks like this:
TravelLogID CityID StartDate EndDate 1 1 2025-01-11 2025-01-16 2 2 2025-01-11 2025-01-16 3 3 2025-01-11 2025-01-16 4 4 2025-01-11 2025-01-16 5 5 2025-01-11 2025-01-16 6 6 2025-01-11 2025-01-16 7 7 2025-01-11 2025-01-16 8 8 2025-01-11 2025-01-16 9 9 2025-01-11 2025-01-16 10 10 2025-01-11 2025-01-16The docs for DBCC CHECKIDENT say this if I run with only the table parameter: "If the current identity value for a table is less than the maximum identity value stored in the identity column, it is reset using the maximum value in the identity column. " I run this code:
DELETE dbo.TravelLog WHERE TravelLogID >= 9
GO
DBCC CHECKIDENT(TravelLog, RESEED)
GO
INSERT dbo.TravelLog
(
CityID,
StartDate,
EndDate
)
VALUES
(4, '2025-09-14', '2025-09-17')
GO
What is the identity value for the new row inserted by the insert statement above? See possible answers