Both Serializable and Snapshot isolation levels exclude concurrency issues such as Dirty Reads, Non-repeatable Reads and Phantoms. However the way in which they deal with such issues is quite different. In this article, Sergey Gigoyan explains the main differences between the two.
2016-01-13
3,453 reads
There are several ingenious ways of using SQL References to enforce integrity declaratively. Declarative Referential Integrity (DRI) is more effective than using procedural code in triggers, procedures or application layers because it uses the SQL paradigm, thereby making optimisation easier and providing clearer expression of the rules underlying the data. Joe Celko explains.
2016-01-12
6,270 reads
Both management and various departments rely on data reports to help guide their business decisions. Rob Gravelle presents ten open source and commercial report generation tools for MySQL and other relational databases.
2016-01-11
4,964 reads
SQL Server 2016 comes with several new features including new DAX functions to enrich the functionality, Daniel Calbimonte takes a look.
2016-01-08
4,503 reads
At last, SQL Server has caught up with other RDBMSs by providing a useful measure of JSON-support. It is a useful start, even though it is nothing like as comprehensive as the existing XML support. For many applications, what is provided will be sufficient. Robert Sheldon describes what is there and what isn't.
2016-01-07
9,007 reads
It is important to only allow authorized individuals access to confidential data. Therefore when setting up an Always Encrypted table it is important to consider splitting configuration tasks between multiple individuals/groups to improve security. Follow Greg Larsen as he shows how to setup up SQL Server Always Encrypted tables where database administrators can’t see the clear text confidential data.
2016-01-06
4,919 reads
Paul White spends some time optimizing update queries in order to explore some SQL Server internals.
2016-01-05
7,525 reads
Sometimes the stress of interdepartmental friction within organisations can get on top of you, especially between the business and IT when the going gets tough. Simple-Talk's answer is a board game to put it all into perspective. Instead of getting carried away, play the board game instead and reach catharsis.
2016-01-04
2,372 reads
PowerShell is like any computer language: you must understand the paradigms, the constructs, and the way it is designed to work to get the most value from it. It is no good just translating 'sausage-string' procedural algorithms. To demonstrate how Powersahell should be used as its' creators intended, Laerte Junior shows the difference between PowerShell problem-solving with, and without, PowerShell paradigms.
2016-01-01
6,637 reads
Kendra Little takes a look at the upcoming SQL Server 2016 'Number of Rows Read' feature in action.
2015-12-31
4,462 reads
By Steve Jones
“Don’t aim to have others like you; aim to have them respect you.” –...
Many years ago, before I joined Oracle, I was working on a major modernisation...
If you work with data pipelines, SQL, notebooks, or machine learning models, a Mac...
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
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In SQL Server 2025, I have a table (dbo.UserPermission) that contains this data:
UserID UserPermissions 15 23 37What is returned when I run this code:
select bit_count(UserPermissions) as PermissionCount from dbo.UserPermission where UserID = 3;See possible answers