David Poole

David Poole has been developing business applications since the days of the
Commodore Pet.

Those were the days when 8K was called RAM not KEYBOARD BUFFER.

He now works as Data Solutions Architect at Moneysupermarket
  • Interests: Badminton, Cycling and Music. Keen piano player.

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Blogs

Stop Using Pandas for Aggregations — Try DuckDB Instead

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

Understanding Fabric Ontology

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

QUOTENAME Basics: #SQLNewBlogger

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

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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

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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;

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