Bert Wagner

Bert Wagner is a Business Intelligence Developer at Progressive Insurance. He enjoys solving challenging data transformations with T-SQL and optimizing for query performance. In addition to BI development, Bert loves building ASP.NET MVC web apps and building Internet of Things projects.

Blog Post

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: )

1,320 reads

Blog Post

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: )

1,721 reads

Blog Post

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

8 reads

Blog Post

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

239 reads

Blog Post

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

8 reads

Blog Post

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

14 reads

Blog Post

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

5 reads

Blog Post

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: )

1,246 reads

Blogs

Using CAT for Testing of Data Agents

By

In last months one of the scenarios where you can use AI has been...

Are you getting value from your reporting?

By

Do you spend so long manipulating your data into something vaguely useful that you...

The Book of Redgate: SQL Server Central

By

It was neat to stumble on this in the book, a piece by me,...

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Forums

Backup to Immutable Storage

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Backup to Immutable Storage

Microsoft Security Changes and SQL Server

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Microsoft Security Changes and SQL...

Expanding into Print

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Expanding into Print

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Question of the Day

Backup to Immutable Storage

In SQL Server 2025, a backup can be made on Azure Immutable Storage. What changes in how the backup is created?

See possible answers