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: )

1,325 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: )

1,726 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

243 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

10 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

7 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

19 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: )

1,253 reads

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Running a Parameter-Sensitive Stored Procedure on a Secondary Replica

By abdalah.mehdoini

Hello , I would like to run a stored procedure on a secondary replica...

Pro SQL Server Internals

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Question of the Day

Running SQLCMD II

I run this command to start SQLCMD:

sqlcmd -S localhost -E -c "proceed"
At the prompt, I type this (the 1> and 2> are prompts):
1> select @@version
2> go
What happens?

See possible answers