Articles

External Article

SQL Database: How to Configure Active Geo-Replication

Active Geo-location is powerful magic for ensuring the high availability of a Azure SQL database, and for disaster-recovery. In choosing the best options, you need to accurately understand the value that the business places on the service you're running, long it will take for a secondary replica to be in synch with the primary replica, the importance of spreading the location of replicas widely, and the maximum tolerable unscheduled downtime. Just clicking all the options could prove to be expensive.

2016-10-27

3,361 reads

External Article

Master Data Services – The Basics

Master Data Services (MDS) is Microsoft's platform for supporting Master Data Management (MDM). A system like MDS, if properly maintained, gives organisations a powerful alternative to increasingly having to centralize databases as a way of preventing data from getting out sync or become inconsistent, and a reliable way of managing the flow of data through corporate IT systems. It makes microservice architectures realistic. Hari Yadav shows you how to get up and running with MDS.

2016-10-25

4,165 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