John Sansom

John Sansom (Blog | Twitter) is a Microsoft Certified Master (MCM) of SQL Server and publisher of the free SQL community ebook DBA JumpStart, an inspiring collection of advice for Data Professionals, written by 20 SQL Server experts. Awarded the Microsoft Community Contributor(MCC) award, John is a prolific blogger and can be found regularly writing about SQL Server and Professional Development over at www.johnsansom.com.

All authors

All authors

Blogs

Stop Using Pandas for Aggregations — Try DuckDB Instead

By

If you've ever loaded a 2 GB CSV into pandas just to run a...

Understanding Fabric Ontology

By

What problem is Fabric Ontology trying to solve? For years, most data conversations have...

QUOTENAME Basics: #SQLNewBlogger

By

Recently I ran across some code that used a lot of QUOTENAME() calls. A...

Read the latest Blogs

Forums

Database Mail in SQL Server 2022

By Abdellateef Ibrahim

Comments posted to this topic are about the item Database Mail in SQL Server...

Stairway to Reliable Database Deployment Level 3 – Rehearsing Changesets Across Environments

By Massimo Preitano

Comments posted to this topic are about the item Stairway to Reliable Database Deployment...

QUOTENAME Quote Parameters

By Steve Jones - SSC Editor

Comments posted to this topic are about the item QUOTENAME Quote Parameters

Visit the forum

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