IN vs UNION ALL
Watch this week’s episode on YouTube. When you need to filter query results on multiple values, you probably use an IN() statement or multiple predicates separated by ORs: or...
2019-05-13 (first published: 2019-04-30)
1,252 reads
Bert Wagner
Correlated Subqueries vs Derived Tables
Correlated subqueries provide an intuitive syntax for writing queries that return related data. However, they often perform poorly due to needing to execute once for every value they join on....
2019-05-07 (first published: 2019-04-23)
1,660 reads
Temporary Staging Tables
Watch this week’s episode on YouTube. SQL Server Spool operators are a mixed bag. On one hand, they can negatively impact performance when writing data to disk in tempdb....
2019-05-07
227 reads
Temporary Staging Tables
Watch this week's video on YouTube
SQL Server Spool operators are a mixed bag. On one hand, they can negatively impact performance when writing data to disk in tempdb. On...
2019-05-07
3 reads
IN vs UNION ALL
Watch this week's video on YouTube
When you need to filter query results on multiple values, you probably use an IN() statement or multiple predicates separated by ORs:
WHERE Col1 IN...
2019-04-30
2 reads
Window Functions vs GROUP BYs
There are many options available for improving the performance of a query: indexes, statistics, configuration settings, etc… However, not all environments allow you to use those features (eg. vendor...
2019-04-25 (first published: 2019-04-16)
1,220 reads
Correlated Subqueries vs Derived Tables
Watch this week's video on YouTube
Correlated subqueries provide an intuitive syntax for writing queries that return related data. However, they often perform poorly due to needing to execute once for...
2019-04-23
6 reads
Data Type Precedence and Implicit Conversions
SQL Server needs to make sure data types match when performing operations that involve multiple pieces of data. When the data types do not match, SQL Server has to...
2019-04-22 (first published: 2019-04-09)
659 reads
Testing with Temporary Stored Procedures
A while back I learned that it’s possible to create temporary stored procedures in SQL Server. I never put that knowledge into practice however because I struggled to think of...
2019-04-16 (first published: 2019-04-02)
834 reads
Window Functions vs GROUP BYs
Watch this week's video on YouTube
There are many options available for improving the performance of a query: indexes, statistics, configuration settings, etc...
However, not all environments allow you to use...
2019-04-16
3 reads
Blogs
Attacking the Weakest Link
By Brian Kelley
When I look at a system and think about its security model, the first...
Webinar – Microsoft Fabric for Dummies
On Wednesday May 15th 2024 I will give a free webinar on MSSQLTips.com about...
Migrate datetime data to datetimeoffset with AT TIME ZONE
By Will Assaf
I recently reviewed, worked on, and added a similar example to the DATETIMEOFFSET Microsoft...
Forums
Extend Event with sqlserver.login
My knowledge of Extended Events is limited, but I am trying to capture some...
ghost backups processed 0 pages
I've got something I'm not aware of performing backups of my dbs at random...
Stored Procedures - passed string than variable length
Dear all, I was just wondering: Can you change the default behaviour as illustrated...
Question of the Day
The Backup File Extension
I run this command in SQL Server 2022. What is the extension of the backup file?
BACKUP DATABASE HerdofTwo TO DISK = 'HerdOfTwo_20240501'See possible answers