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SQL Server-XML-Lesson 9-Using trigger to raise an error when the user tries to delete a customer from the Customers table | SQL courses

In this video, we will use a trigger to raise an error when the user tries to delete a customer from the Customers table.

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Title: SQL Server-XML-Lesson 9-Using trigger to raise an error when the user tries to delete a customer from the Customers table

Duration:  20 minutes

Summary: In this video, I am going to continue my discussion on triggers. I will wrap up with the instead of trigger. Using this trigger we will raise an error when the user tries to delete a customer from the Customers table. We will write the error message and change the status of the customer to ‘inactive’ instead. Then we move into discussing table-valued functions and cross-apply. First we created an Employees table and a Departments table. Then, we wrote a table-valued function that uses a CTE to create and return a table based on the manager id. The function will return the manager and all the employees reporting to him/her. Finally, we used a cross-apply and an outer-apply to see how we can join between the Departments table and the table-valued function.

Methodology of the development of example: Good coding standard and simplified design to illustrate the key points.

Technology Used: XML and SQL Server 2008

Keywords: table, database, primary key, trigger, raiserror, instead of trigger, drop trigger, inner join, table-valued function, returns, anchor section, recursive section, Common Table Expression (CTE),  union all, cross apply, outer apply.



Senior Software Engineer with experience in C#, JavaScript, jQuery, Knockout JS, Kendo UI, HTML5, and SQL Server. Ayad has more than 20 years experience in technical training and teaching. Contributor to MrBool for about 7 years.

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