2021-10-08
2,248 reads
Database Design
Much Ado about nothing: missing data
Joe Celko explains how missing data is handled from the printing press to databases.
2021-07-26
Constraints and declarative referential integrity
Database systems have powerful features built right in that can ensure the integrity of data. In this article, Joe Celko discusses keys and constraints.
2021-05-28
Creating Database Build Artifacts when Running Flyway Migrations
This article provides PowerShell automation scripts for running Flyway database migrations. These scripts use SQL Compare to automatically generate all the required database build artifacts in the version control system, for each Flyway deployment.
2021-04-26
Customizing Database Deployments using Flyway Callbacks and Placeholders
How to customize a database deployment process using Flyway, demonstrating how to incorporate tasks such stamping a version number into the latest database build, or writing to the SQL Server log.
2021-02-26
Implementation of Normalization in SQL Server
Introduction In my last article, Discussion on Normalization and Database Design Concepts, I discussed about the normalization concepts. Here, I will take one table in SQL Server and implement different normal forms. As we move up the higher normal forms, we end up on more number of tables. Implementation of Normal Forms Let us start […]
2021-02-22
4,551 reads
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Forums
Cleaning Up the Cloud
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The Maximum Value in the Identity Column
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Oracle Performance Tuning: Practical Techniques Every DBA Should Master
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Question of the Day
The Maximum Value in the Identity Column
I have a table with this data:
TravelLogID CityID StartDate EndDate 1 1 2025-01-01 2025-01-06 2 2 2025-01-01 2025-01-06 3 3 2025-01-01 2025-01-06 4 4 2025-01-01 2025-01-06 5 5 2025-01-01 2025-01-06I run this code:
SELECT IDENT_CURRENT('TravelLog')
I get the value 5 back. Now I do this:
SET IDENTITY_INSERT dbo.TravelLog ON
INSERT dbo.TravelLog
(
TravelLogID,
CityID,
StartDate,
EndDate
)
VALUES
(25, 5, '2025-09-12', '2025-09-17')
SET IDENTITY_INSERT dbo.TravelLog OFF
I now run this code.
DBCC CHECKIDENT(TravelLog)
GO
INSERT dbo.TravelLog
(
CityID,
StartDate,
EndDate
)
VALUES
(4, '2025-10-14', '2025-10-17')
GO
What is the value for TravelLogID for the row I inserted for CityID 4 and dates starting on 14 Oct 2025?
See possible answers