One of the many ways a relational table differs from the file structures used by pre-relational storage systems is that the tables, rows and columns can have constraints on them. This allows you to reduce the types of bad data that can be loaded into your tables.
2024-06-17
In theory, you get better execution plans when SQL Server understands the contents of your tables. In practice, well, it's hit or miss.
2018-11-23
3,977 reads
2016-02-23
1,500 reads
Check Constraints play a very important role in SQL Server as it allows data validation rules to be imposed at the SQL Server instance level itself instead of writing rules for each application.
2013-08-08
5,038 reads
When Agile meets 'Big Design', the result can be frustration on both sides. Is it possible for database development to to easily coexist with Agile methodologies for application development? Nick suggests that the technical solutions already exist, and the dissonance is more due to cultural and organizational problems
2011-05-04
6,129 reads
A number of different processes that can be used to make sure your data validates against your business rules. This article discusses how you can use database "check constraints" to validate your data within the SQL Server database engine.
2009-04-10
2,542 reads
A while back I wrote a quick post on setting up key mappings in...
By Steve Jones
In 100 years a lot of what we take to be true now will...
At Saturday the 21st of February I’m presenting an introduction to dimensional modelling at...
Hello, I inherited a number of tables with like 20-30 column using nvarchar(256) in...
Hi, i'm running vs2022. I'm trying out a c# script that i'd like to...
I upgraded a SQL Server 2019 instance to SQL Server 2025. I wanted to test the fuzzy string search functions. I run this code:
SELECT JARO_WINKLER_DISTANCE('tim', 'tom')
I get this error message:Msg 195, Level 15, State 10, Line 1 'JARO_WINKLER_DISTANCE' is not a recognized built-in function name.What is wrong? See possible answers