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
Join Red Gate for a free seminar on September 20 (the day before SQL Saturday San Diego). SQL Server MVPs, Steve Jones and Grant Fritchey will present informative sessions featuring best practices for SQL Server database administration, in addition to showing Red Gate tools in action.
2013-08-13
1,611 reads
This PASS VC Webinar will take place August 14, 1PM EDT. Creatively resolving differences and negotiating mutually beneficial agreements is crucial in all walks of life. It’s especially important and challenging in the IT industry where soft skills are not necessarily prevalent. ??In this session, we’ll introduce the basic concepts and precepts that will aid you in negotiating better agreements with your neighbors, peers and co-workers, and even your boss.
2013-08-12
2,763 reads
Do you use SQL Doc? We're building the new version, and we'd like your help. Complete the survey for a chance to win a $50 Amazon voucher.
2013-08-09
2,743 reads
SQL Saturday comes to Oklahoma City on August 24th for a free day of SQL Server training and networking. This event also features a paid-for pre conference session on Friday with Bill Pearson on Practical Self-Service BI with PowerPivot for Excel.
2013-08-08
2,213 reads
Business Intelligence Markup Language (Biml) automates your BI patterns and eliminates the manual repetition that consumes most of your time. On October 15th come see why BI professionals around the world think Biml is the future of data integration and BI.
2013-08-07 (first published: 2013-07-17)
6,591 reads
QL Saturday is coming to Curacao, Netherlands Antilles for a free day of SQL Server training and Networking on August 17. There will also be a pre-conference session on Practical Self-Service BI with PowerPivot for Excel.
2013-08-06
2,135 reads
This metric returns the number of ‘login failed’ error messages found in the SQL Server error log file in the last hour.
2013-08-02
3,642 reads
Come to SQL Saturday New York on August 17 for a day of free SQL Server training and networking. Some of the speakers at this event include Chris Bell, Ben DeBow, Ashish Sharma, and Hilary Cotter
2013-08-02
2,661 reads
Data Céilí 2026 Call for Speakers is now live! Data Céilí (pronounced kay-lee), is...
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In SQL Server 2025, how many columns can be included in a Primary Key constraint?
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