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SQLServerCentral Editorial

Virtual Events Are Here To Stay

  • Editorial

This week was the MVP Summit. As was the case for the last couple of years, the event was entirely virtual. We were shown a bunch of new and interesting things by Microsoft. We were able to talk to each other and to the engineers at Microsoft. I'm honored that I've been an MVP and […]

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2022-04-02

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SQLServerCentral Editorial

Another look at table variables

  • Editorial

Becoming overly enthusiastic about a new SQL Server feature can backfire if you don’t do some testing. One example is the table variable introduced with SQL Server 2000. At the time, there was a myth that table variables would always perform better than temp tables with the reasoning that, by definition, variables are stored in […]

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2022-02-26

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SQLServerCentral Article

SQL Log File Too Big

  • Article

Is your SQL database log file too big? Maybe it is. But maybe it’s not. When log files keep growing and appear to be too big some might suggest switching to Simple recovery, shrinking the log file, and switching back to Full recovery. While this will work to shrink the file and free up disk […]

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2022-02-16

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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