A foreign key points to a primary key that must exist in another table, for example, column X in Table 1 must also be present in Table 2. The key protects this link, and only valid data can be inserted in the foreign key column. An untrusted foreign key may threaten a database’s referential and data integrity.
2013-08-20
2,554 reads
Join Red Gate for a free seminar on September 27 (the day before SQL Saturday Denver). Steve Jones, SQL Server MVP and editor-in-chief of SQLServerCentral.com, will present best practices for SQL Server database development, in addition to showing Red Gate tools in action.
2013-08-20
1,406 reads
This article shows how to implement a Slowly Changing Facts Table, how to overcome the problems encountered when using the MERGE statement to process the data and suggest a minimal set of indexes to aid data loading and quering.
2013-08-19
10,191 reads
It’s hard to avoid privacy-based stories at the moment, with growing concern over government snooping and the limits of power. But where I’m based, in the UK, there’s a new, fully-privatised invasion of privacy. One marketing company has created an outdoor wi-fi basestation that grabs your phone’s MAC address as you pass, with the idea […]
2013-08-19
79 reads
How much of an improvement in processing time can a simple SQL Server Analysis Services (SSAS) partitioning structure provide? Can you provide any examples? Does this processing time improvement only apply to the fact tables? Check out this tip to learn more.
2013-08-19
4,512 reads
Though the Key/Value pair paradigm is common to almost every computer language, there is no clear agreement yet for the definition of a Key/Value Pair database. However, Key/Value pair databases are valuable for special applications where speed of writing data is more important than searching and general versatility. Buck Woody experiments.
2013-08-16
3,457 reads
This article describes different methods for deploying your SSIS projects to a server.
2013-08-15
10,075 reads
I’ve introduced my manager to SQL Server’s cloud based platform, SQL Azure and Windows Azure Virtual Machine. He wants to test functionality with some of our applications, which would require me to move my on premise databases to the Azure Virtual Machine. What is the easiest way to accomplish this task? See how it is done in this tip.
2013-08-15
2,928 reads
The SQLServerCentral.com survey will end on Wednesday August 21st. Let us know how we're doing and be in with a chance to win a $100 Amazon gift card. Winners will be announced later that week.
2013-08-15
2,625 reads
In this article Greg Larson outlines the exciting new features that come along with SQL Server 2014. He'll also let you know where you can download CTP1, as well as where you can find additional resources related to SQL Server 2014.
2013-08-14
4,381 reads
By Vinay Thakur
Continuing from Day 3 where we covered LLM models open/closed and their parameters, Today...
By Steve Jones
One of the nice things about Flyway Desktop is that it helps you manage...
By HeyMo0sh
Microsoft Fabric (not to be confused with the more general term “fabric” in DevOps)...
I'm fairly certain I know the answer to this from digging into it yesterday,...
Hi Team, I am trying to refresh the Azure Synapse Dedicated pool from production...
hi everyone I am not sure how to write the query that will produce...
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