Although adding multiprocessing capabilities to applications is labor-intensive and error-prone, adding multicore capability to SQL query processing can be automatic, benefiting huge numbers of applications with little developer effort.
2009-04-02
2,311 reads
Recent installments of our series dedicated to SQL Server 2005 Express Edition have focused on error handling techniques that leverage Service Broker's transactional nature. This article describes Poison Message detection characteristics and presents an example demonstrating its use.
2009-04-02
1,585 reads
Too many authors in the field of relational theory have neglected the concept of Cardinal Reciprocity. This can cause a number of subtle problems with database design in terms of its derivability, redundancy, and consistency. . Increasingly, this little-understood aspect of relational theory, that emphasises the cardinality of the attributes of tuples in a relation and the reciprocity with isomorphic foreign key restraints, is becoming a hot forum topic.
2009-04-01
2,846 reads
Many SQL Server developers and DBAs have, in the past, had their own favourite diagnostic Stored Procedures for investigating blocking issues. But since SQL Server 2005, it's a good idea to use the SQL Profiler for all but the most complex problems. Brad McGehee takes us through the steps...
2009-03-31
3,761 reads
This article introduces the reader to Powershell. The application that it demonstrates is one that monitors SQL Server Agent to make sure it is running.
2009-03-31
3,061 reads
One of the main features of Oracle Business Intelligence Publisher (BIP) is its ability to connect to pretty much every major RDBMS on the market. Steve Callan shares the little documented steps of how to establish a connection to SQL Server.
2009-03-30
1,937 reads
Most SQL Server users drop one object at a time using either SSMS or a single drop statement. In many scenarios we may need to drop several objects of the same type. Is there a way to drop several objects through less lines of code?
2009-03-30
4,719 reads
Why does DBCC CHECKDB find corruption errors that disappear? Does tempdb really cause performance issues? Are there any drawbacks to using the FILESTREAM datatype? Paul Randal answers these reader questions and more.
2009-03-27
4,251 reads
Operations Manager has stacks of reports to help you monitor your applications' uptime, but reporting can be difficult until you understand all the different options, parameters, and the structure of the Operations Manager health model. Firstly, you need a clear idea about the way that your organization defines 'uptime', and only then you can start your reports. Thomas LaRock explains...
2009-03-27
1,755 reads
Gail Shaw, the fabled 'gilamonster', earned her MVP and the gratitude of a host of SQL Server professionals seeking technical help with her expert forum posts on SQLServerCentral. She brings great enthusiasm to everything she does, and has a huge influence on the communities she joins.
2009-03-25
2,216 reads
By Brian Kelley
I will be leading an in-person Certified Information Systems Auditor (CISA) exam prep class...
EightKB is back again for 2026! The biggest online SQL Server internals conference is...
By HeyMo0sh
Working in DevOps long enough teaches you two universal truths: That’s exactly why I...
Hi all, I just started using VS Code to work with DB projects. I...
Comments posted to this topic are about the item Fun with JSON II
Comments posted to this topic are about the item Changing Data Types
I have some data in a table:
CREATE TABLE #test_data
(
id INT PRIMARY KEY,
name VARCHAR(100),
birth_date DATE
);
-- Step 2: Insert rows
INSERT INTO #test_data
VALUES
(1, 'Olivia', '2025-01-05'),
(2, 'Emma', '2025-03-02'),
(3, 'Liam', '2025-11-15'),
(4, 'Noah', '2025-12-22');
If I run this query, how many rows are returned?
SELECT t1.[key] AS row,
t2.*
FROM OPENJSON(
(
SELECT t.* FROM #test_data AS t FOR JSON PATH
)
) t1
CROSS APPLY OPENJSON(t1.value) t2; See possible answers