Quantifier predicates
Predicates in SQL are often complex and difficult to understand. In this article, Joe Celko explains the logic behind a few of the predicates: EXISTS, SOME, ANY and ALL.
2022-01-14
T-SQL
How to Create a FOR Loop in SQL Server
Learn different ways to create FOR Loops using T-SQL such as using WHILE loops, cursors, tally tables and more.
2021-12-31
2021-12-29
558 reads
SQL Server instance startup type check by SQL script
I have developed the script to check SQL Server instances startup type, sometimes we didn't know all our SQL instances startup type correctly configurated, especially we cannot distinguish the Automatic and Automatic(Delayed Start) from the direct query, the only way is querying from the registry, you can use this script in your environment to bulk […]
2021-12-24
1,560 reads
BETWEEN the two of us
BETWEEN can be used in a SQL WHERE clause to filter on a range. Joe Celko explains the history of BETWEEN and also could be implemented.
2021-12-15
2021-12-08
642 reads
Get backup folder sizes from shared Location
Got a message from the Operation team as below Hi Harsha, I'm seeing a larger than normal rate of change for a week day on the backups for the SQL2000 servers. Did anything run differently yesterday compared to Monday? I have 22 sql servers and all the Weekend and Monthly backups goes to the location […]
2021-12-03
594 reads
Trusting STRING_SPLIT() order in Azure SQL Database
Learn about the changes to the STRING_SPLIT function in Azure SQL Database that allows you to specify ordinal position of the output.
2021-12-03
SQL Server Data Masking: a comparison with Gallium Data
Introduction In SQL Server 2016, Microsoft introduced a new feature called dynamic data masking, which allows you to mask the values of certain columns and keep that data hidden from certain users, without having to modify your applications. Let's take a look at how SQL Server does data masking, and compare it to the way Gallium Data […]
2021-12-03
1,976 reads
Creating Markdown Formatted Text for Results from T-SQL
Markdown documents are becoming increasingly more popular and relevant with the emergence of notebooks. Markdown is a markup language for creating formatted text. It is widely used in tools for collaboration, tools for creating documentation and notebooks. Formatting is easy to understand, readable, simple to adopt, and agnostic. I can use a markdown document on […]
2021-11-29
11,668 reads
Blogs
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Forums
SQL Art, Part 4: Happy 4th of July — A British DBA's Guide to Celebrating a War We Don't Talk About
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
SQL Server Enum Implementation: A Single-Row View Strategy for Avoiding Magic Values
Comments posted to this topic are about the item SQL Server Enum Implementation: A...
BIT_COUNT I
Comments posted to this topic are about the item BIT_COUNT I
Question of the Day
BIT_COUNT I
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