Dustin Ryan is a Data Platform Solution Architect on the Education Specialist Team Unit at Microsoft. Dustin has worked in the business intelligence and data warehousing field since 2008, has spoken at community events such as Code Camp, SQL Saturday, SQL Rally, and PASS Summit, and has a wide range of experience using the Microsoft business intelligence stack of products across multiple industries. Prior to his time at Microsoft, Dustin worked as a business intelligence consultant and trainer for Pragmatic Works, a Microsoft partner. Dustin is also an author, contributor and technical editor of books such as Applied Microsoft Business Intelligence, Professional Microsoft SQL Server 2012 Analysis Services with MDX and DAX, and others. You can learn more about Dustin at http://SQLDusty.com.

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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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