Ryan Adams

Ryan Adams is a Senior Premier Field Engineer for Microsoft. He works directly with customers to help them realize their business potential and accelerate their digital transformation on premises and in the cloud.

Previously, Ryan was a Microsoft Data Platform MVP and spent 19 years working for a fortune 100 company. His passion is the SQL Server Engine, High Availability, and Disaster Recovery. He also served on the Board of Directors for the North Texas SQL Server User Group, was President of the PASS Performance Virtual Chapter, was a PASS Regional Mentor, and served as a Director for the PASS organization.

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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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