Performance Surprises and Assumptions : GROUP BY vs. DISTINCT
Aaron Bertrand acknowledges that DISTINCT and GROUP BY are usually interchangeable, but shows there are cases where one performs better than the other.
2017-02-23
8,502 reads
Articles
2017-02-22
121 reads
Questions About the Use of PowerShell That you were Too Shy to Ask
Let's forget the actual PowerShell code for a moment: Why is PowerShell important? Why should I use it? Where did it come from? Why did it take so long to arrive? These and many other basic questions are answered in William Brewer's latest addition to the series that answers those seemingly simple questions that you were too shy to ask in public.
2017-02-22
7,518 reads
How to Recover a SQL Server Login Password
I will describe a simple method anyone can use to obtain lost password information for a SQL Server login.
2017-02-21 (first published: 2013-03-04)
66,326 reads
2017-02-21
1,282 reads
Getting Started with Azure SQL Data Warehouse - Part 1
As the demand for data analytics grows so does the need for a technology or platform to process large amounts of different types of data in timely manner. Azure SQL Data Warehouse is a new enterprise-class, elastic petabyte-scale, data warehouse service that can scale according to organizational demands in just a few minutes. Read on to learn more about this data warehouse-as-a-service offering from Microsoft.
2017-02-21
5,158 reads
New CREATE OR ALTER statement in SQL Server 2016 SP1
Ahmad Yaseen explains what SQL Server 2016 SP1's new CREATE OR ALTER statement does, and how to use it.
2017-02-20
5,523 reads
Using EXCEPT to Determine Row Differences
How to use the EXCEPT statement to perform row differences.
2017-02-17 (first published: 2014-03-25)
51,851 reads
Introduction to SAP HANA on Azure
Microsoft and SAP share a long history of working together on a variety of interoperability solutions, including SAP Fiori and Office 365. In recent years, this trend has been exemplified by advancements in support for SAP-based solutions on Microsoft Azure. Marcin Policht provides an overview, focusing in particular on support for SAP HANA on Azure.
2017-02-17
4,185 reads
vCenter Server fails to start, Purge and Shrink Vcenter SQL Database
In this article, you will learn how to troubleshoot If your vCenter Server fails to start and and manually purge the Vcenter database if required.
2017-02-16
8,447 reads
Blogs
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Understanding Fabric Ontology
By James Serra
What problem is Fabric Ontology trying to solve? For years, most data conversations have...
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The string_agg function
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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