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Technical Article

Automatically Failover (Enable or Disable) Jobs Based on HADR Role

If you have a SQL Server with a High Availability solution (AlwaysOn Availability Groups, Database Mirroring, etc.), and you also have a bunch of jobs which you need to be run on the Primary server only. You need to be able to "failover" the jobs in case the Primary server is no longer Primary.

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2018-11-14 (first published: )

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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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