Articles

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Constraint Yourself!

In his first article for Simple-Talk, Joe Celko demystifies the use of Constraints, and points out that they are an intrinsic part of SQL and are a great way of ensuring that a business rule is done one way, one place, one time.

2008-10-30

2,846 reads

External Article

Database Mirroring adjusting the automatic failover time

One of the configuration options for Database Mirroring is the High Availability mode. With this option three servers are put in place the principal, mirror and witness servers. This is the only option that allows for automatic failover. One of the things that I have noticed is that when there are periodic network issues a failover occurs even though there are no issues with the Principal server. Are there any options to delay the failover?

2008-10-29

3,626 reads

External Article

Encryption Alternatives

Databases often contain sensitive information and cell-level encryption is a very effective method to protect this information from those who should not have access to it. Although, encryption is not without its challenges.

2008-10-29

3,815 reads

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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 2025-01-06
I 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