Andy Warren

I started my SQL journey here at SQLServerCentral as one of the founders, helping to build a place to share and learn that continues to thrive under the editorial guidance of my friend Steve Jones. I've done a lot of volunteer work over the years ranging from our local SQL group (oPASS, SQLOrlando) to serving on the Board of Directors of PASS to designing and building the framework of SQLSaturday (which has gone on to produce more than 1000 locally managed events since we started in 2007). These days I manage a DBA team, but over the years I've been a trainer, consultant, contractor, and DBA. I'm rarely present on social media, the best way to contact me is here, LinkedIn, or via email.

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SQLServerCentral Article

Worst Practices - Objects Not Owned by DBO

Last week Andy launched a new series about Worst Practices by talking about why the Hungarian naming convention is bad for column names. This week he's at it again, declaring that the practice of having objects owned by anyone other than dbo is BAD! Agree or disagree, we think you'll enjoy reading this article and adding your thoughts to the discussion!

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2019-08-01 (first published: )

38,430 reads

Blog Post

Low Tech Repeating Tasks in Trello

I mentioned in earlier posts that I’m using Trello this year for managing SQLSaturday tasks and figured I might as well go all in and add some of the...

2019-07-26 (first published: )

293 reads

Blog Post

SQLSaturday Automatic Messages

For those who haven’t used the admin tools for SQLSaturday when an event is created there are a set of messages loaded automatically. It’s up the event admin if...

2019-07-12 (first published: )

283 reads

Blog Post

Trello For The User Group

I’m trying Trello this year to manage both SQLSaturday and our other events. Part of that is giving the whole team visibility of the work that remains to be...

2019-06-18

71 reads

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Question of the Day

The string_agg function

We create the following table and then insert some records in it: 

create table t1 (
   id int primary key,
   category char(1) not null,
   product varchar(50)
);

insert into t1 values
(1, 'A', 'Product 1'),
(2, 'A', 'Product 2'),
(3, 'A', 'Product 3'),
(4, 'B', 'Product 4'),
(5, 'B', 'Product 5');
What happens if we execute the following query in both Sql Server and PostgreSQL? 
select id, 
category, 
string_agg(product, ';')
                 over (partition by category order by id
                 rows between unbounded preceding and unbounded following) as stragg
from t1;

See possible answers