T-SQL: Why “It Depends”
Why does everyone use "it depends" as an answer to many T-SQL questions? Bob Hovious brings us a short example of how performance can change based on data loads for the same code.
2010-03-16
13,220 reads
T-SQL
2010-03-11
4,739 reads
2010-03-09
4,360 reads
Procedural, Semi-Procedural and Declarative Programming in SQL
A lot of the time, the key to making SQL databases perform well is to take a break from the keyboard and rethink the way of approaching the problem; and rethinking in terms of a set-based declarative approach. Joe takes a simple discussion abut a problem with a UDF to illustrate the point that ingrained procedural reflexes can often prevent us from seeing simpler set-based techniques.
2010-03-09
3,459 reads
2010-03-08
4,667 reads
2010-03-02
4,060 reads
Randomizing Result Sets with NEWID
Seth Delconte brings us a technique to solve a common request. Using the NEWID function to return a random record from a result set.
2010-03-01
7,369 reads
2010-02-22
3,832 reads
Cleaning Up Garbage from Data
Cleaning up garbage from data can be a big problem for a developer.Check out a simple solution from Shubhajyoti Ghosh to cleaning up garbage from data.
2010-02-22
10,746 reads
Tips for Simplifying Crosstab Query Statements
Rob Gravelle takes a complex SQL statement and shows you several ways to re-write it that both simplifies and shortens it, while still yielding the same results.
2010-02-22
4,532 reads
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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