Temporal tables were introduced with SQL Server 2016. To take advantage of this feature, you might start fresh with a brand new table. It is possible, however, to convert an existing table with accumulated history to the new functionality. In this article, Mala Mahadevan explains how to create temporal tables for both scenarios.
2019-04-01
When you index a nullable field, are the rows with nulls stored in the index? It’s easy enough to find out by creating a table with a nullable field, and then creating an index on it.
2019-03-29
Even when creating games, your code has access to environment variables and document files. In this article, Lance Talbert shows how to access files to convince the player that maybe the game knows more than it should.
2019-03-28
In this article we walk through a step-by-step example on how to create an Azure Data Lake Linked Service in Azure Data Factory v2.
2019-03-27
Back to the basics: learn how to Create, Read, Update and Delete operations are pivotal for any database application. Plus, you’ll see how to use Stored Procedures to manipulate data on the database side instead of on the application side.
2019-03-26
This article by Adam Aspin reviews the Azure Cosmos DB SQL API from the perspective of the relational database developer. More specifically it will show you how to leverage your Structured Query Language skills to exploit the core possibilities of Cosmos DB as a NoSQL document database.
2019-03-25
219 reads
Michael J. Swart posted an interesting question: he had a large table with 7.5 billion rows and 5 indexes. When he deleted 10 million rows, he noticed that the indexes were getting larger, not smaller.
2019-03-22
2,752 reads
I noticed the Lookup function in SQL Server Reporting Services. In this tip we look at all three SSRS lookup functions: Lookup, LookupSet and MultiLookup.
2019-03-22
2,097 reads
Index maintenance can be a real headache for database administrators as tables grow larger and maintenance windows shrink. In this article, Greg Larsen demonstrates resumable index operations available with SQL Server 2017 and 2019. This feature helps DBAs work around those small maintenance windows by allowing certain index operations to be paused and restarted again later.
2019-03-21
1,738 reads
In this tip we look at how to configure Azure Data Factory to move data from an on-premises SQL Server database to an Azure SQL Database.
2019-03-20
1,813 reads
By James Serra
I’m honored to be hosting T-SQL Tuesday — edition #192. For those who may...
By Vinay Thakur
Continuing from Day 2 , we learned introduction on Generative AI and Agentic AI,...
Quite the title, so let me set the stage first. You have an Azure...
hi everyone I am not sure how to write the query that will produce...
Comments posted to this topic are about the item Rollback vs. Roll Forward
Comments posted to this topic are about the item Foreign Keys - Foes or...
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 *
FROM OPENJSON(
(
SELECT t.* FROM #test_data AS t FOR JSON PATH
)
) t; See possible answers